He always runs where others walk......but about mjollnir,

Mjollnir means "crusher," referring to its pulverizing effect. It is related to words such as the Icelandic verbs mölva ("to crush") and mala ("to grind"), but similar words, all stemming from the Proto-Indo-European root melə can be found in almost all European languages, e.g. the Slavic melvo ("grain to be ground") and molotu ("hammer"), the Dutch meel(wiki(!)

We have a word : 'mollen' which means to crush, destroy, to ruin. That might come from the same origin.