Where does “peffamäki” come from?

peffamäki (Finnish) comes from Finnish Mäki, from Finnish -lä, from Finnish -as, from Proto-Finnic -s, from Proto-Finno-Ugric -s.

Ancestry of “peffamäki”, step by step

peffamäki traces back through two separate lines of ancestry.

via Finnish Mäki

StepLanguageWordMeaning
1FinnishMäkiAny of a number of small places in Finland
2Finnish-läFront vowel variant of -la
3Finnish-asForms some adjectives; Forms some nouns
4Proto-Finnic-sForms nouns
5Proto-Finno-Ugric-s—

via Finnish peffa

StepLanguageWordMeaning
1Finnishpeffabuttocks
Every word from Proto-Finno-Ugric -s →Every word from Finnish -lä →Every word from Finnish Mäki →