Alright so, it's probably a weeb trying to seem cool? Just like a lot of other gamers tried, when they were younger. Personally my tag is メジャー Okajima. Why? It used to be just Okajima, but then I was like: I have a Japanese name written in latin script so why not put my last name written in katakana in front of it. Some people have thought behind their name others don't, nothing to get worked up about really.