Where does “rune” come from?

rune (Middle English) comes from Old English ryne, from Old English rinnan, from Proto-West Germanic *rinnan, from Proto-Germanic rinnaną, from Proto-Indo-European h₃ér- — to move, to stir.

Ancestry of “rune”, step by step

StepLanguageWordMeaning
1Old Englishrynecourse, path along which motion takes place
2Old Englishrinnanto run
3Proto-West Germanic*rinnanto run, to flow
4Proto-Germanicrinnanąto run, to rush; to flow
5Proto-Indo-Europeanh₃ér-to move, to stir
Every word from Proto-Indo-European h₃ér- →Every word from Proto-Germanic rinnaną →Every word from Proto-West Germanic *rinnan →