Over my 32 years I have had a few to say the least...
First are the variations of Melissa~ Missy~Mel~Lissa~Lissy
Then there is my Sister status~Sissy
Then there is my School Days~Spud~Spudnic (not sure how it was derived but this was Marvin James' fault when we had some Math class together when I was a freshman he started calling me Spud... which turned into Spudnic by Brucie)
Then there are the names Seana calls me (MJ and Chompers)
And now I get MOM and MOMMY!!! (which isn't really a nickname persay but I really love being able to say I get the honor of being called it!)