I love, love,
love it! But for a boy. I do see it as a unisex name though so I don't really dislike it as a name for a girl but it's just so much better as a masculine name in my opinion.
I can't come up with a full name with the nn
Darcy but I love the combo
Darcy Alexander and I think
Darcy Alexandra is just as nice.
Other suggesttions:
Darcy IsadoraDarcy Louise /
LouisaDarcy Madeleine