An Old Irish name it means "white, bright, fair, handsome".
The actor's real name is Cory, if that's what you mean. In the show, his name really is Finn.
Finn Ohara's birth name is Grifith Finn O'Hara.
Finn Taylor's birth name is Finn William Taylor.
Finn Gesner's birth name is Finn Harry Gesner.
Camila Finn's birth name is Camila Caroline Finn.
Carina Finn's birth name is Carina Kathleen Finn.
Dan Finn's birth name is Daniel Anthony Finn.
Jack Finn's birth name is Anthony Jack Finn.
Veronica Finn's birth name is Veronica Lee Finn.
William Finn's birth name is William Alan Finn.
Yes. As a last name from Ó Finn (descendant of Fionn).
Finn Sivertsen's birth name is Kre Sivertsen.