Finley means "white warrior" so obviously it is a boy's name originally.
But this is an etymological site, many people here care about origins and meanings. Most other people don't. Names are just letters and sounds.
I suspect that many will find Finleigh a great girl's name.
"But it’s all right now.
I learned my lesson well.
You see you can’t please everyone
So you got to please yourself."
Rick Nelson, GardenParty
"It does not become me to make myself smaller than I am." (
Edith Södergran 1891-1923)