Tucker, Gizmo, Shiloh and Luna all had names when I got them so I left them.
Chase - I changed his name to Chase, after a character on One Tree Hill.
Pip and Squeak got their names as babies when I was told I wasn't allowed to keep them I referred to them as the Pip Squeaks, and the names stuck.
MaveRick - A friend named him after a character on Top Gun.
Macy - Didn't know what to name her and came across that name that a chin friends chin was named. Ask him if he minded that I use the name and of course he didn't, so she became Macy.