I liked
Naoise once upon a time, for a boy. I haven't given it any thought recently but it's still nice.
Do you live in the US? If so, you're going to deal with a lot of people balking at the spelling of
Naoise. You might as well also deal with their confusions that a boys' name can end in the "ah" sound. Remind them of
Joshua and
Elijah. To me, it seems a bit much to go to the effort of spelling and pronouncing
Naoise the traditional Gaelic way, but then to play gender swops with it.