I'm not sure, but I'm sure there must some blasphemy involved... but, then again, we are Viking Kitties and not above such things...
Thor is the son of Odin, and the Norse patron god of the warrior, the guardian who leaves his fields and flocks, defeats the invaders, and returns to his home.
Thor is the Champion of Asgard, and the pitiless foe of the Frost Giants. Thunder is his laughter, and lightning his tool.
Perhaps not Mjolnir as a screen name; rather, as a symbol.