Finnegan is a surname to me, not a fn. If
Finnegan is a family surname for you, then it would be very cool to see the heritage handed down. If not, then I would steer clear of the trendy, other-people's-surname fad.
Personally, I think
Finn is a kick a$$ name in its own right. See:
http://en.wikipedia.org/wiki/Fionn_mac_Cumhail Just think how much fun it would be to read him stories of his namesake
Finn McCool at bed time.
But if you want a longer formal name, then there are plety of bona fide Fin- names to choose from:
Fintan, Finan (Fionan),
Fingal,
Finbarr. I can give you more information on any of these if you wish.
Finn is catching on as a fn in
Ireland, by the way. I just visited my cousin with kids in school over there.
I love all of your girl names, except
Scarlett. I'm trying to like this name, but the theme from Gone with the Wind drowns out any other thoughts. Cheesy romance novel heroine is all I can think of. (I loved the book and still love watching the movie. I just can't take the name
Scarlett seriously for a real person.)
For the boy's, I love
Henry and
Isaac. As for trendy
Sawyer and especially
Jackson, see my comments on
Finnegan above. One note, would you really want a (Huck)
Finn and a (
Tom)
Sawyer under one roof?