I used to play professional paintball.
When playing a game, it is important to be able to communicate quickly and clearly with your teammates so everyone knows what needs to be done on the field, or if any status changes have occurred (players eliminated, change in position, etc.)
Normally last names were used, but mine sounded to much like other commands called during the course of a match.
Zweefer was the moniker given to indicate me, as it didn't sound like anything else one would hear during a game. Phonetically it carried over the noise of the guns and paint, and was short as well.
Eventually i answered to Zweefer as much as my real name, and its been with me ever since.
The added bonus is there are very few Zweefers out there (I think I'm the only one) so getting the name when registering for things is pretty easy