Where does “rengasavain” come from?

rengasavain (Finnish) comes from Finnish rengas, from Proto-Finnic rengas, from Proto-Germanic hrengaz, from Proto-Germanic hringaz, from Proto-Indo-European (s)krengʰ-, from Proto-Indo-European (s)ker-, from Proto-Indo-European sek- — to cut, cut off, sever.

Ancestry of “rengasavain”, step by step

rengasavain traces back through two separate lines of ancestry.

via Finnish rengas

StepLanguageWordMeaning
1Finnishrengasring, loop, hoop; tyre, tire; ring
2Proto-Finnicrengasring, hoop
3Proto-Germanichrengazring
4Proto-Germanichringazring, circle; curve; sound, ring
5Proto-Indo-European(s)krengʰ-to turn, bend
6Proto-Indo-European(s)ker-to cut off; to turn, bend
7Proto-Indo-Europeansek-to cut, cut off, sever

via Finnish avain

StepLanguageWordMeaning
1Finnishavainkey; code; clef, used especially in compound...
2Finnishavatato open; to unwrap; to turn on
3Proto-Finnicavait'akto open
4Proto-Finno-Ugricaŋa-—
Every word from Proto-Indo-European sek- →Every word from Proto-Indo-European (s)ker- →Every word from Proto-Indo-European (s)krengʰ- →