Well, to be honest:
I used to call them Eppylon, because I genuinly thought that was their name. Then I learnt (when talking to Ethan on IRC) that it actually isn't Eppylon but Epponllyn And that was just last week or so..
But I keep using Eppylon 'cause that's how I call them! But mostly it's Eppy though.
The funny thing is you still didn't spell it right. It's Eponllyn. :3