Why is everyone so stinky about spellings of old norse words? Back then, literacy was much more rare and spelling much more loose. You make a fool of yourself placing such an importance of something so insignificant. Mjollnir, Mjulnir, Mulnir, Mjolner, it's all the same. The idea is what is important. If you have a European surname, check that as well. Chances are it was spelled 20 different ways throughout history.