I use Daetrin as a online handle as there are numerous Paul's around and it gets too confusing remembering which John, Peter, etc. people are talking about - it's nice to have something unique. My lastname also is kinda dorky, so I didn't want to use that.
Lastly, with multiple costumes it means I have to register with a different display name on each board, e.g. TK-8020, TD-8020, IC-8020, CC-8020, TC-8020 - just became a bother. So having the same name is handy.
Daetrin is a character from one of my favorite books from one of my favorite authors, so I just adopted it.