Rikki - my mom has called me this since I was a baby, derived from my name (Erika). She nicknamed me after her favorite story, Rikki Tikki Tavi. It’s a story about a brave mongoose who triumphantly defeats a snake that is trying to harm its adoptive family.
Bebz - a nickname of a nickname. My family members have always called me Beba, my friends caught on to this. One of my friends shortened this nickname to “Bebz” and it kind of stuck when everyone else heard it.
E. Money - short, simple, my name is erika, everyone knows i get money. People just put the two together and BOOM there it was.