Old Norse berserkr

← English berserk (mention)

← Old Norse bjǫrn (mention)

← Old Norse serkr (mention)

← Old Norse berr (mention)

→ English berserker (derived)

→ Danish bersærk (derived)

→ French berserk (borrowed)

→ Polish berserk (borrowed(pl/en))

→ Polish berserk (borrowed)

→ Swedish bärsärk (derived)