How do you spell kevin in irish?

There isn't a single, universally accepted Irish spelling for Kevin. The name is of Irish origin, but its spelling in Irish has evolved and varies depending on the dialect and the specific transliteration used. You'll commonly see:

* Caoimhín: This is a very common and traditional spelling. The 'h' is silent.

* Caoimhin: A simpler, less formal variation of Caoimhín.

There are other, less common variants as well. So, while there's no single "correct" spelling, Caoimhín is probably the most widely recognized and accepted.