Pól Ó hÉimhín says.....

Find out what your name is in Irish.

There is no website that tells you how to pronounce your name, once you've found out what it is though.

(Ta Enda)

(update: My mother speaks Irish, but even she didn't know what Irish for Evans was until I showed her this. Now she's seen it written, she says that it's pronounced O'Haven)