We were given a kitten on Cinco de Mayo, and told it was male. We named him "Cinco". Then the vet told us that he is a she! So we figured we might need to call her "Cinca". As in Roberto -> Roberta. It doesn't matter that it wouldn't mean "five" any more. Would love to hear your thoughts!

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    Locked comments from question and answers because of repeated extended discussions. It is abundantly clear to everyone that cardinal numbers are invariable in Spanish. Please do not start another extended discussion on this thread.
    – wimi
    Commented May 8, 2021 at 21:43

3 Answers 3


If you are asking whether there are masculine names that end in "a" and feminine names that end in "o", then there are. For example:

  • Borja and Bautista are masculine names ending in "a"

  • Consuelo and Amparo are feminine names ending in "o".

So calling a female cat "Cinco" would not violate any rule. No rule says that nouns or names ending in "o" must be masculine and nouns or names ending in "a" must be feminine. That is just something that happens in the vast majority of the cases.

"Cinca" is, by the way, the name of a river in Spain.

Apart from that, the name of your cat is of course your choice. "Cinco" will sound like a number, "Cinca" not necessarily.


If you want to combine the number five, because that is the day you were given the cat, and its female sex, you can use the ordinal number which, unlike the cardinal one, varies according to gender:

  • Mi gata se llama "Quinta" porque me la regalaron el quinto día de mayo.

Spanish names are usually O for boys and A for girls. Juan/Juana.

There are a few exceptions as posted by wimi above.

However, numbers in Spanish are invariable so cinca is not the "feminine of cinco".

Uno, dos, tres, cuatro, cinco, seis= Invariable.

Cinca is merely attempting to make feminine something that is invariable.

You can name your cat whatever you want.

The connection to Cinco de Mayo will be lost if you call her Cinca.

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    "O for boys and A for girls. Juan / Juana" Eh, where is the O in Juan?
    – RubioRic
    Commented May 10, 2021 at 5:47
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    @RubioRic The "o" will only appear in the diminutive "Juanito" :)
    – Gustavson
    Commented May 10, 2021 at 12:05
  • @Gustavson You're absolutely right.
    – RubioRic
    Commented May 10, 2021 at 12:16

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