Gender of Nouns in Welsh

In Brief

Every Welsh noun is grammatically masculine or feminine. The most important beginner pattern is that the definite article y/yr/'r causes a soft mutation in many feminine singular nouns: merch “girl” becomes y ferch “the girl,” while masculine bachgen stays y bachgen. Gender also affects adjectives, pronouns, some numbers, and demonstratives, so learn a noun together with its gender.

Overview

A noun is a word for a person, place, object, or idea, such as bachgen “boy,” afon “river,” or cariad “love.” Welsh assigns each noun to one of two grammatical genders: masculine (gwrywaidd) or feminine (benywaidd). Unlike modern English, this distinction applies not only to people but also to objects and ideas. A house, tŷ, is masculine; a river, afon, is feminine.

Gender is introduced at A1 because it appears in very common phrases. It can change the first sound of a noun after “the,” the first sound of an adjective after a feminine noun, and the words used for “he/it,” “she/it,” “this,” and some numbers. This change at the beginning of a word is called an initial mutation. The mutation most closely connected with gender is the soft mutation.

There are a few useful tendencies, but no ending tells you the gender of every Welsh noun. English speakers therefore need a new vocabulary habit: do not learn only cadair “chair”; learn cadair (f.), and preferably the phrase y gadair “the chair.” The visible mutation makes gender easier to remember when the noun begins with a letter that can change.

How It Works

The beginner rule

Start with these four points:

1. Welsh singular nouns are masculine or feminine.
2. After the definite article, many feminine singular nouns undergo soft mutation.
3. A following adjective usually undergoes soft mutation after a feminine singular noun.
4. Learn gender as part of the noun’s dictionary entry.

The definite article has the forms y, yr, and 'r. These forms depend on the surrounding sounds, not on gender: broadly, y appears before a consonant, yr before a vowel or h, and 'r after a vowel. Welsh has no separate words corresponding to English “a” and “an.”

Noun	Gender	Indefinite meaning	Definite form
bachgen	masculine	a boy	y bachgen
merch	feminine	a girl	y ferch
tŷ	masculine	a house	y tŷ
afon	feminine	a river	yr afon
ci	masculine	a dog	y ci
cath	feminine	a cat	y gath

Notice that yr afon does not visibly reveal its gender: a vowel cannot show the consonant mutation. Gender is grammatical information, not simply whatever can be seen after the article.

Soft mutation after the article

The full soft-mutation pattern is useful as a reference:

Basic initial	Soft-mutated initial	Example with a feminine noun
p	b	pont → y bont (“the bridge”)
t	d	tref → y dref (“the town”)
c	g	cath → y gath (“the cat”)
b	f	buwch → y fuwch (“the cow”)
d	dd	dinas → y ddinas (“the city”)
g	disappears	gardd → yr ardd (“the garden”)
m	f	merch → y ferch (“the girl”)
ll	l	general soft-mutation pattern
rh	r	general soft-mutation pattern

There is an important limit to the article rule: feminine nouns beginning with ll or rh traditionally do not mutate after the article. For example, feminine llaw remains y llaw “the hand.” Letters outside the table do not have a soft-mutated form, so a feminine noun such as afon may show no visible change.

Masculine nouns do not mutate merely because they follow the article:

• bachgen → y bachgen, not y fachgen
• ci → y ci, not y gi
• tad → y tad, not y dad

A noun can, however, mutate for another grammatical reason. Mutation does not always prove that a noun is feminine; the trigger and the whole phrase matter.

Adjectives after feminine singular nouns

An adjective describes a noun: “small,” “black,” and “tall” are adjectives. In Welsh, an adjective usually follows the noun. A feminine singular noun normally causes soft mutation of a following adjective, whether or not the noun has the article.

Masculine singular	Feminine singular	Meaning
bachgen bach	merch fach	a small boy / a small girl
ci du	cath ddu	a black dog / a black cat
dyn tal	menyw dal	a tall man / a tall woman
y bachgen bach	y ferch fach	the small boy / the small girl

In y ferch fach, there are two effects: the article mutates merch to ferch, and the feminine noun mutates bach to fach. English has no comparable change, so it helps to practise the whole phrase rather than translating one word at a time.

Not every adjective begins with a mutable letter. In cadair newydd “a new chair,” newydd remains unchanged even though cadair is feminine.

Pronouns: “he/it” and “she/it”

When a noun is replaced by a pronoun—a short word used instead of repeating the noun—Welsh can reflect grammatical gender. Masculine nouns are associated with e/fe in much of southern Welsh and o/fo in much of northern Welsh; feminine nouns use hi.

Noun	Gender	Possible reference
llyfr “book”	masculine	Mae e ar y bwrdd. — It is on the table.
cadair “chair”	feminine	Mae hi yn y gegin. — It is in the kitchen.

The regional choice between e and o is not a gender difference: both are masculine. At first, concentrate on recognising masculine e/o versus feminine hi rather than trying to use every regional form.

Gender with numbers

The numbers two, three, and four have masculine and feminine forms when they directly count nouns.

Number	Masculine	Feminine
two	dau	dwy
three	tri	tair
four	pedwar	pedair

For example, compare dau fachgen “two boys” and dwy ferch “two girls.” Number phrases also have their own mutation rules, as these examples show. It is best to learn the number form and the resulting noun phrase together. The noun after a cardinal number normally remains singular in Welsh, even where English uses a plural.

Gender with demonstratives

A demonstrative is a word such as “this” or “that,” used to point something out. In the standard pattern with the article, hwn accompanies a masculine singular noun and hon a feminine singular noun. Hyn is used with plurals.

Gender/number	Pattern	Example
masculine singular	y + noun + hwn	y bachgen hwn — this boy
feminine singular	y + noun + hon	y ferch hon — this girl
plural	y + plural noun + hyn	y merched hyn — these girls

Everyday Welsh also commonly uses patterns such as y llyfr yma “this book” and y gadair yna “that chair.” The words yma and yna do not themselves show masculine versus feminine gender.

What happens in the plural?

The strongest gender effects described above belong to the singular. A feminine plural noun does not mutate after the article just because its singular is feminine:

• merch → y ferch (“the girl”)
• merched → y merched (“the girls”), not y ferched
• cath → y gath (“the cat”)
• cathod → y cathod (“the cats”), not y gathod

Likewise, the gender-based mutation of a following adjective does not carry over in the same way: compare singular merch fach with plural merched bach. Plural phrases have their own patterns, but the masculine/feminine contrast is much less visible.

Examples in Context

Welsh	English	Note
Mae'r bachgen yn darllen.	The boy is reading.	Masculine bachgen does not mutate after the article.
Mae'r ferch yn darllen.	The girl is reading.	Feminine merch becomes ferch.
Mae'r tŷ yn hen.	The house is old.	Tŷ is masculine.
Mae'r afon yn hir.	The river is long.	Afon is feminine, but its vowel shows no mutation.
Mae'r ci du yn cysgu.	The black dog is sleeping.	Masculine noun; du remains unchanged after it.
Mae'r gath ddu yn cysgu.	The black cat is sleeping.	Both cath and following du undergo soft mutation.
Dyma fachgen bach.	Here is a small boy.	Bachgen is mutated by dyma, not by gender; bach remains unmutated after the masculine noun.
Dyma ferch fach.	Here is a small girl.	Dyma mutates merch, and feminine merch mutates bach.
Ble mae'r llyfr? Mae e ar y bwrdd.	Where is the book? It is on the table.	Llyfr is masculine; o may replace e regionally.
Ble mae'r gadair? Mae hi yn y gegin.	Where is the chair? It is in the kitchen.	Feminine cadair takes hi when referred to as “it.”
Mae gen i ddau fachgen.	I have two boys.	Masculine form dau; the number phrase causes mutation.
Mae gen i ddwy ferch.	I have two girls.	Feminine form dwy; merch becomes ferch.
Dw i'n adnabod y bachgen hwn.	I know this boy.	Masculine demonstrative hwn.
Dw i'n adnabod y ferch hon.	I know this girl.	Feminine demonstrative hon.
Mae'r merched bach yma.	The small girls are here.	In the plural, neither merched nor bach has the feminine-singular mutation.

Common Mistakes

Mutating every noun after “the”

• Wrong: y fachgen for “the boy”
• Right: y bachgen
• Why: The article causes gender-based soft mutation only in a feminine singular noun. Bachgen is masculine.

Forgetting the mutation of a feminine noun

• Wrong: y cath
• Right: y gath
• Why: Singular cath is feminine, so its initial c becomes g after the article.

Mutating the noun when there is no article or other trigger

• Wrong: gath for “a cat” in isolation
• Right: cath
• Why: Welsh has no indefinite article. Gender alone does not mutate the beginning of a bare noun. Compare cath “a cat” with y gath “the cat.”

Remembering the noun mutation but not the adjective

• Wrong: y ferch bach
• Right: y ferch fach
• Why: The article mutates merch, while the feminine singular noun separately mutates following bach.

Applying the feminine singular rule to plurals

• Wrong: y ferched fach
• Right: y merched bach
• Why: The gender-based article and adjective mutations do not apply to the plural in the same way.

Guessing gender from meaning or spelling

• Wrong assumption: every object is neuter, or every noun with a certain ending has one predictable gender
• Better approach: record tŷ (m.), afon (f.), llyfr (m.), and cadair (f.) as complete vocabulary items
• Why: Welsh has no neuter noun class, and most noun endings are not reliable enough to replace learning the gender.

Usage Notes

Gender labels appear in dictionaries as m. or gw. for masculine (gwrywaidd), and f. or b. for feminine (benywaidd), depending on the dictionary’s language and conventions. When adding vocabulary to your notes, copy that label and add the definite form: gardd (f.), yr ardd.

Spoken Welsh varies by region. Masculine pronouns may sound like e, fe, o, or fo, and everyday demonstrative constructions often favour y ... yma/yna. These differences do not remove grammatical gender. They simply mean that gender is more audible in some constructions than in others.

Some nouns have variable gender in actual usage, and dictionaries may record regional or historical differences. When reliable references disagree, follow the variety you are learning while remaining ready to recognise another form. For ordinary beginner vocabulary, a good modern dictionary is safer than guessing.

Beyond the Basics: Later Patterns and Exceptions

You do not need to master everything in this section at A1, but these points explain forms that you will meet later.

Mutation has many triggers

Gender is only one source of soft mutation. Words and constructions such as dy “your,” dau/dwy “two,” dyma “here is,” and predicative yn can also cause mutation. That is why Dyma fachgen contains fachgen even though bachgen is masculine. Always ask what grammatical element triggered a mutation rather than treating every mutated form as evidence of feminine gender.

This is especially useful with adjectives. In an attributive phrase—an adjective directly attached to a noun—compare bachgen tal and merch dal. But after predicative yn, both genders can show mutation: Mae'r bachgen yn dal and Mae'r ferch yn dal (“The boy/girl is tall”). In those sentences, tal becomes dal because of yn, not because of the subject’s gender.

A few adjectives have special feminine forms

Most everyday adjective agreement is visible through soft mutation, but a small number of adjectives also preserve distinct feminine forms in some styles. A familiar example is masculine gwyn and feminine gwen “white/fair”; after a feminine noun, the latter can appear mutated, as in merch wen. Usage varies by adjective, register, and region, so learn these as individual patterns rather than inventing feminine forms.

Natural sex and grammatical gender are not identical

With words for people and animals, gender often matches natural sex: bachgen is masculine and merch is feminine. Yet grammatical gender belongs to the noun itself, not directly to the person, animal, or object in the world. This matters with general human terms, animal names, and nouns whose reference can have either sex. In real conversation, pronoun choice may also follow the known person or animal. A dictionary’s gender label remains the guide to article and adjective mutation.

Possessive ei shows gender through mutation

Written Welsh uses ei for both “his” and “her,” but the following mutation distinguishes them: masculine “his” normally causes soft mutation, while feminine “her” normally causes aspirate mutation. This belongs to the wider possessive system, not the beginner article rule, but it is another reason noun and pronoun gender continue to matter at higher levels.

Practice Tips

1. Learn a three-part bundle. Write cath — f. — y gath or bachgen — m. — y bachgen on each vocabulary card. For nouns beginning with a vowel or an unchanging consonant, keep the gender label because the article may not reveal it.
2. Build adjective pairs aloud. Take one masculine and one feminine noun and add the same adjective: ci du, cath ddu; bachgen bach, merch fach. This practises gender and mutation together.
3. Use pronouns and demonstratives in a second sentence. Point to an object and say y llyfr hwn ... mae e ... or y gadair hon ... mae hi .... Connecting the noun, demonstrative, and pronoun makes gender easier to remember than memorising a label alone.

Related Concepts

• Prerequisite: The Definite Article — introduces y, yr, and 'r, the forms that expose gender through mutation.
• Next step: Plural Formation — shows how singular nouns form plurals, where gender effects are less visible.
• Next step: Basic Adjectives — develops adjective position and mutation after feminine singular nouns.
• Next step: Demonstratives — practises hwn, hon, and plural hyn as well as everyday yma/yna patterns.