I do think of names in advance, but I wait to name the fish until after I get them. I haven't used any of my pre-prepared names yet. :P
For example, when I brought Robert home I looked through my list and then suddenly decided he needed to be named after a dead arctic explorer because of his white lips. xD And then the rest of my fish became the other deceased members of his exploration party.
Robert Falcon Scott - Red salamander HM plakat
Passed on- Friedrich "Freedy"
Four African Dwarf Frogs - Dorkus, Sporkus, Baron(ess), and Bubbles!