Where does “hjärnflykt” come from?

hjärnflykt (Swedish) comes from Swedish hjärna, from Old Norse hjarni, from Proto-Germanic hersô, from Proto-Indo-European ḱerh₂s-, from Proto-Indo-European ḱerh₂- — head, top; horn.

Ancestry of “hjärnflykt”, step by step

hjärnflykt traces back through two separate lines of ancestry.

via Swedish hjärna

StepLanguageWordMeaning
1Swedishhjärnaa brain; a brain; someone who provides the...
2Old Norsehjarnithe brain
3Proto-Germanichersôcrown of head
4Proto-Indo-Europeanḱerh₂s-head; hornet
5Proto-Indo-Europeanḱerh₂-head, top; horn

via Swedish flykt

StepLanguageWordMeaning
1Swedishflyktflight, escape; flight
Every word from Proto-Indo-European ḱerh₂-Every word from Proto-Indo-European ḱerh₂s-Every word from Proto-Germanic hersô