Marna just reminded me (formerly a Catie) of the time my ex (still a friend) and his wife got a new dog and named her Katy.

We were all just like, "to someone who didn't know us all this would seem reaaaallly sketchy..."

But really. All version of Katie/Katy/Catie are excellent names for kids and they're excellent names for dogs too! I say, go out and be-Katy the world.