You can change your username? Hmm. Nice.
CellyCell came from a nickname given back my freshman yr in HS.
My real name is Celia - and a local rapper is named Celly Cel (minus one L). So this friend of mine, we'd always yell out each other's name during passing period and she thought CellyCell was much better than calling out Celia.
My mom has always called my Celly or Chelly - so it fits. Now I prefer everyone to call me Celly since its more difficult to actual pronouce Celia correctly.
Everyone I know either calls me Celly Cell, Celly Mutha ****in Cell (ha the fellows) or just Celly. I love my nickname. Ha.