My username is my real first name. I'm kind of boring that way, anymore, although I had fun with various screen names years ago.
My family has always called me Dee, though, so I happily answer to that too. And it's shorter to write (hint, hint). I started using my full first name as a young adult cuz my last name is Weed. "Dee Weed" got far too many snickers and disbelieving looks when I moved away from small town Iowa, started college, and lived in the real world.
My nieces and nephews -- all with the last name of Weed -- got tee shirts to wear on their 21st birthday celebrations. The logo on the tees said "A friend with Weed is a friend indeed." They of course got into hot water with some authorities who didn't appreciate the pun.