I love it when a nickname takes off - especially but not just when I've come up with it.
In primary school I was playing lunchtime cricket and building a nice partnership with this kid Simon Mamouney. My calls evolved from "Yes, Mamouney", to "Shot, Mamouney-Babooney", to "Yeah, Babbles". For the rest of his school days and I don't know how much longer, everyone called him Babbles. In Year 7, one of my Year 8 mates would call us all "Sonny". Then for no reason it stuck on this one kid to the point that even teachers and parents called him Sonny. Some of the kids in our year level never even knew his real name, Sonny was such a good fit.