Old Norse serkr

← Proto-Germanic *sarkiz (derived)

→ English berserk (mention)

→ English berserk (mention)

→ English Serkland (mention)

→ Old English sierce (cognate)

→ Danish bersærk (mention)

→ Old Swedish særker (inherited)

→ Old Norse berserkr (mention)

→ Polish berserk (mention)

→ Russian сорок (cognate)

→ Swedish särk (inherited)

→ Swedish bärsärk (mention)