I've known many animals with human type names- myself included. I once knew a cow named Rebecca...haha!

We've also had a similar issue with the name we have so far picked our boy due in February. My mum and dad had a dog called it just before I was born. So even though my mum's 1st thing she said when we told her our preferred name was 'that was our dogs name'- she still likes the name, but at the end of the day its up to us anyway.

So I say use it. Don't worry about it being someone else's dog name. If it helps abit too one of my friends named her baby girl Darcey just recently...its a pretty name.