For
betta I like to go with people names:
Jasper, Holly, Mr. Peach (named after Mr. Pink from the movie Reservoir Dogs), Sebastian, it thought it suited my yellow betta, Sky b/c of the blue coloring and I am considering names for my new guy now. Aries: b/c it's soon going to be aries in the month, horoscope wise and Aries (spelled different is a Greek god)
Angelfish: Angel (duh) female angelfish, Ziggy b/c of her stripes and Smokey, when I first got him he looked like a smoky brownish black color.
Plecos: Blue Panaque: Doobie it suits his laid back personality.
Datnoid: Scooby, b/c of the cartoon Scooby Doo. He is a scardey cat/fish! Just like Scooby & Shaggy, taking off hiding then peeking out from the spot.

My blue hap ahli pair are the only African cichlids we have named, I have had them since they were an inch and they are full grown now. Spike(his white blaze up he face & dorsal looks spiky) is the male, and Blu is the female (blue hap).