Where does “purkinavain” come from?

purkinavain (Finnish) comes from Finnish avain, from Finnish avata, from Proto-Finnic avait'ak, from Proto-Finno-Ugric aŋa-.

Ancestry of “purkinavain”, step by step

purkinavain traces back through two separate lines of ancestry.

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-

via Finnish purkki

StepLanguageWordMeaning
1Finnishpurkkican; jar; canister
2Swedishburkpot, can, jar; an inflexible vessel, usually with...
3Old Swedishbudhker
4Old Norsebuðkr
Every word from Proto-Finno-Ugric aŋa-Every word from Proto-Finnic avait'akEvery word from Finnish avata