i talk to my fish, too, but i'm a crazy pet lady! i used to name fishies when i was a kid, but just haven't lately. it is getting rather hard to keep saying "the older dojo loach with the freckles", though. i think i'm like RockabillyChick, name the oddballs.
I CAN tell all my fish apart, even the schoolers (but then I've never had more than 7 of any species at a time). But i still don't name them
My boyfriend tried to name our betta (now deceased) Betta Max, or Max for short, but it never stuck.
Right now the only named fish I have are "Minnie" and "Ricky" my dwarf puffers. Minnie is named for the favorite pomeranian of the Osbournes (you're supposed to say it like Sharon does, "Miiinnniie!"). Ricky is named after Ricky Ricardo. If I end up getting a third, a female, she'll be Lucille Ball or Lucy for short. I normally think it's dumb to name animals in pairs (Salt and Pepper, Laverne and Shirley), but it's somehow OK for dwarf puffers. They're just so cute!