Technically the first distro i used was Lubuntu 10.04, but it was only a live cd because i was 13 by then and i was terrified that i installed linux and my father got angry at me if i left any evidence. The first one i used as a full SO to use as i like, Raspbian, so debian (wheezy, i believe).
I also use mythological names. Specially god names and mainly egyptian gods:
Anubis is my main one, 24/7 server. Ra is the one i use to experiment with and Zeus is my vps with vpn
For some very specialized cases that i used in the past for my Raspberry pi 4, i used Odin (i installed Huggin there), Tenjin (no reason at all, i just like it) and Khonshu