I always name my husband's fish... I wait till I get an idea what their personality is like and go from there...
like he had a shrimp that was so crazy and always wanted to fight.. so I named him Bucky
He has a jawfish now that digs a whole for a home and peeks out of it so I named him Master P. for Master Peeker
and once he had these three top feeder fish that hogged ALL the food so I named them the three little pigs...
What is your fish's personality like and maybe that will help you come up with a name..