How do you say nana in Irish?

There isn't a single perfect equivalent for "nana" in Irish, as the word's meaning depends on context (grandmother, a term of endearment, etc.). However, here are some options depending on what nuance you want to convey:

* Seanmháthair: This is the most literal translation, meaning "old mother." It's a respectful term for grandmother.

* Máthair mhór: This means "big mother" and is a more affectionate term.

* Mamó: This is a common and affectionate diminutive, similar to "Granny" or "Grandma."

The best choice depends on your relationship with the person and the level of formality you want. `Mamó` is likely the closest in feeling to "nana" in many cases.