i already posted my names however i was driving down the street last night and these came to mind! If you had the name Serindipity in the registered/formal name you could call her Serin. I think that is pretty.
Also I met someone with the name Tysz. All week I called her (in my head)
Tizzy!

YOU know how yorkies run around like they are in a Tizzy??? Anyway later I actually found out it was Ukrainian and is pronoucned Tish.
Either way i love it!
Let us know what you decide.