Being a near religious cartoon lover, all I can think of is Finn the Human from Adventure Time. Not a bad association, by any stretch, but it could still cause some teasing over the name. Other than that, it's not a bad name at all. I like it.
I love the names Finley and Finnegan, so it makes sense that I also like this name a lot. It makes a great nickname for guys named Finley or Finnegan, of course, but it works just fine on its own. It has a very pleasant sound, and it's short and simple without being too minimalist or youthful. Great name, like Brynn, which is another monosyllablic, pleasant-sounding name.