I love films and used to play games like Neverwinter Nights and Baldur's Gate quite a lot.
When I decided to create a nickname, I combined these two things I like, from the film Romeo + Juliet (directed by Baz Luhrmann 1996) and the type of weapon named 'Longsword' in DnD computer games.
"Longsword" is also name for a shotgun in Romeo + Juliet, where in the film they converted the weapons to modern guns but continue the legends and 'personality' from old time weapons.
So I somehow connected the relationships and simply called myself Romeo Longsword and I have been using it for ten years now, but I have been rejected by a certain group of game players before because they did not think I was serious with that name.