I adore
Finn, but I much prefer it as the short form for a longer name.
My personal favourite is Fionnán / Fionán (pro fyun-AWN).
I also like
Dagfinn,
Fingal,
Finnian,
Finley /
Finlay (this is my favourite name ever), Finlo (It's Manx), and Finvey (that's a surname, but it totally counts.)