Sierra was Kira when we got her, and my hubby changed it to Sierra (I think because that's the truck he wants!!! )

Buddy was Barry when we got him, and I didn't like it, so I just started calling him Buddy while I was trying to come up with a name, and it just stuck!!!

Talking about kids naming animals... that's why my in-laws had/have cats named Butch and Spikey!!!