Thor

wiktionary

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Representing Old Norse Þórr (Swedish Tor); cognate with Old English Þunor.

etymonline

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Thor

Odin's eldest son, strongest of the gods though not the wisest, c.1020, from Old Norse Þorr, literally "thunder," from *þunroz, related to Old English þunor (see thunder (n.)). His weapon was the hammer mjölnir ("crusher").