Mine's a kind of interesting story-
So I have a dog named
Aja. When I was younger, a friend kept BEGGING me to join a website, so eventually, I did- and of course, my parents and I were 100% against me using my own name, so we used hers, because nobody could think of anything better and it was easy to remember.
Couple years later, I got another dog-
Tinker (short for Tinkerbell- we rescued her from a terrible home, and changed her name slightly). We decided to add her name in as well, thus- Ajatinker.
It kinda stuck, and I use that just about everywhere now, and I usually go by "Aja" online.