i named my goldfish(shubunkin, comet) and my koi when i had them
P - (koi, his mouth was deformed and when it shut half of it was always open, in a P shape, kinda cute)
Mr.Pink aka Big-(shubunkin, he was pink, name from reservoir dogs, he was the biggest and always had his way)
Diego-(shubunkin, always came to get his food right away, so my friend said "go diego go"-after a discussion on the kids shows the kids i babysit watch)
Phillip-(comet, was just an average orange comet goldfish in a world of colorful and patterened shubunkin and koi, so needed a plain name)
i have a small school of rasboras now, and needless to say.. i dont name them