Mjǫllnir - Wiktionary, the free dictionary
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Most likely from Proto-Norse *ᛗᛖᛚᚢᚾᛁᚨᛉ (*melluniaʀ), from Proto-Germanic *meldunjaz, from Proto-Indo-European *melh₂-. Compare Old Norse myln (“fire”), Welsh mellt (“lightning”), Russian мо́лния (mólnija, “lightning”), Latvian milna (“hammer of Pērkons”).
Alternatively, relation to mjǫll (“fresh snow”) has been proposed.
Mjǫllnir m (genitive Mjǫllnis)