We have a black lab named Gus. He came with the name but funnily enough our friends up the street already had a dog named Gus. We keep trying to figure out what Gus is short for...to give him a full name that's just ours. Sometimes we call him Dingus (because he's a goofball). We've also considered Mundungus, since we had cats name Harry and Ginny (and we still have their sister Hermione and another cat named Minerva). Harry, Ginny and Hermione's mom was named Princess Fluffy Sushicat. We've had a Fred and a George as well....black male cats who we couldn't tell apart.
As a kid I had a cat name Phoebe, which I didn't realize was ironic until I grew up....a cat named after a bird! I also once had a fish named Cliff Fluffy Flash Gorton.