When my first nephew was a baby, he randomly started calling me RaRa.
I never had a nickname growing up, so I decided I would let him keep calling me that.
17 years, 1 more nephew, and 2 nieces later, and I'm Uncle RaRa to all of them now!
I changed uncle to "Unkle" because isn't it cool to misspell words on the internet? haha