Finn's name was chosen because of its awesome possibilities for bad puns.
Here is a famous passage from
James Joyce.
to illustrate this:
Hohohoho, Mister Finn, you're going to be Mister Finnagain! Comeday morm and, O, you're vine! Sendday's eve and, ah you're vinegar! Hahahaha, Mister Funn, you're going to be fined again!