Yes, all of ours have slowly been given odd nicknames too.
So it's not just you.
Trixie is called Waggybottoms have the time because when she gets excited she shakes her whole butt.
Lexi my daughter called Lexi Loo then Lexi Loo Loo, and now we all just call her Loo-Loo half the time.
Chipsie gets called a myriad of things--Chichers, Chits...
Flash we call Plash sometimes because when we got her that's how my kid pronounced her name.
Cody we call Woe or Misser Woe half the time and I have NO IDEA why.
Kasey my dad calls Kase-Kase.