I have five accounts, so I stick with the vowels. Not all, but most, of my characters folllow the rule of having the same name, but with one of the vowels being different on each char.

Arlassa
Arlessa
Arlissa
Arlossa
Arlussa

Risata
Riseta
Risita
Risota
Risuta

etc... I'm on an RP server, so the naming convention is a bit more rigid, but this seems to work.