Sources below
The Old Norse form of the word was berserkr likely means "bearshirt." Ulfheðnar – wolf warriors appear among the legends of the IndoEuropeans, Turks, Mongols, and Native American cultures. The Germanic wolfwarriors have left their trace through shields and standards that were captured by the Romans and displayed in the armilustrium in Rome.

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Sources
Egils saga Skallagrímsonnar/Vatnsdæla saga
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Ynglinga Saga
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Hrólfs saga kraka
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Volsunga saga
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Grettis saga
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Hervarar saga ok Heiðreks
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Germania
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Hrafnsmál
https://skaldic.org/m.php?i=1436&p=text

00:00 Intro
04:15 Ulfhednar
07:45 Berserkers

Frenzy warriors wearing the skins of wolves called Ulfheðnar ("WolfCoats"; singular Ulfheðinn), are mentioned in the Vatnsdæla saga, the Haraldskvæði and the Grettis saga and are consistently referred to in the sagas as a group of berserkers, always presented as the elite following of the first Norwegian king Harald Fairhair. They were said to wear the pelt of a wolf over their chainmail when they entered battle. Unlike berserkers, direct references to ulfheðnar are scant. It is proposed by some authors that the berserkers drew their power from the bear and were devoted to the bear cult, which was once widespread across the northern hemisphere. The berserkers maintained their religious observances despite their fighting prowess, as the Svarfdæla saga tells of a challenge to singlecombat that was postponed by a berserker until three days after Yule. The bodies of dead berserkers were laid out in bearskins prior to their funeral rites.