Growing up I had a group of girlfriends that were a few years older than me. They always had "cool" nicknames for me and I thought it was cool that they included me in their fun. So, my nicknames were Terra Cotta (as in the clay), Teradactyl (like the flying bird dinosaur) and Tiramisu (the coffee cake dessert). My fav was Terra Cotta but I wanted it spelled like my name so I changed it over the years to Taracotta. Then I added 7 because that was my favorite number as a kid and it just has stuck around. I have NO idea why it was my favorite! LOL Taracotta7 is NEVER taken on forums so it works.
BTW.....I am still called those nicknames by those girls. We have remained friends for over two decades!