Mine is simple; when I came to work at the hospital 11 yrs ago this was given to me as my username for all systems that Ineeded to log onto. It's the one thing that doesn't change. I started using it to logon to other things because I knew I'd never forget it. I like to KISS as possible. Especially since I work in the IT dept and deal with enough people who have a hard time with computers. Simple is always better. Our naming convention is either our last name and first and middle initial or if you last name is longer then it's the first 6 of you lastname and initials.
I never thought about making a cute name when I was creating my account on here. I know that on Craftsy I'm GiGi. Lots of them on here and lots of Judys