"Jack" the one-eyed goldfish was originally named Redbeard, but my husband said it was too long and suggested Jack, as in One-Eyed Jack.
"Holly" is a red and white comet goldfish that sort of looks like a Red Cap Oranda, I got her around Christmas time and my friend suggested a Christmasy name.
"Felix" was named by my friend in Michigan, dunno why she said his name should be Felix. He's The Amazing Kaleidoscope Goldfish! He started out silver, then turned a pretty coppery brown color, then got a black streak down his back and on his mouth and tail. Now the streak is gone and he's a light orange color. This is a fish that someone told me would turn white. I guess he's going through every other color first.
"Bob" is my Betta. I was taking him home after work the night I got him and had to stop at Wal-Mart on the way. I set him on my dash and the words, "You stay put, Bob." came out. It has stuck ever since.
"Otie" the otocinclus was named for...well, you can guess! Real original, I know!
"Cocktail" the ghost shrimp...yeah, silly, I know. I couldn't use "Scampi" since he died and I don't recycle pet names.
I don't know why I haven't named my White Clouds, probably because I can't really tell them apart.