It sounds very masculine to me, and I have associatioons with it as a surname (Carlin).
Carly is kind of cute, though I don't care much for it. There are plently of other names that nn could be used for though, like
Carissa,
Carla,
Carlene,
Caroline, etc.
"If you can't laugh at yourself, life is going to seem a whole lot long than you'd like." - Garden State
Hannah