My only creative names currently:
Red betta with 2 ADF
: Bacon, Lettuce, and Tomato.
Alpha male Black Phantom tetra: Richard (well actually its a nickname for Richard)
I started calling my espei rasboras Vick and McCoy, cuz they not that big but still fast
When I get the next 3 they will be called Jackson, Maclin, and Celek until I get bored and just start calling them all Espei.
When I had my salt tank I had Krzyzewski the Blue Devil Damsel.
My regular Oscillaris was of course Nemo and the black and white Oscillaris was Ninja Nemo.