Where does “kukkurapäinen” come from?

kukkurapäinen (Finnish) comes from Finnish kukkura, from Finnish -ra, from Finnish -i, from Proto-Uralic -j — oblique plural.

Ancestry of “kukkurapäinen”, step by step

kukkurapäinen traces back through two separate lines of ancestry.

via Finnish kukkura

StepLanguageWordMeaning
1Finnishkukkuraheaped measure
2Finnish-raForms nouns or adjectives, mostly from nominal...
3Finnish-iA nominal suffix used in eg. ukko → ukki; Used...
4Proto-Uralic-joblique plural

via Finnish pää

StepLanguageWordMeaning
1Finnishpäähead; end, tip
2Proto-Finnicpäähead
3Proto-Uralicpäŋehead
Every word from Proto-Uralic -j