How did they get this name?

[dapoo12]

Does anyone have the slightest clue how this person got this name?

[Chinese Boosting]

Yes, they just didn't pick a username at the start, you can simply close the client when they ask you to put a username and open it again.

[karnivor1]

its coming from changing servers . whenever u change the server and if ur name is not available they give u that kind of temp. name so u can change name .