Mojang Specifications was the former name of the company that develops and runs Wurm Online, it's name is "inspired" by the swedish word Mojäng. The company has been renamed to Onetoofree AB, and then renamed once again to Code Club AB, as on 10/12/11.
On what mojäng means in Swedish; "Thingie is a good translation, it usually refers to a thingie of mechanical sort. Like, a little machine that looks like a trash bin and only jumps up and down, puffing out smoke. For instance." -- Svensson