Where does “selkänahkain” come from?

selkänahkain (Ingrian) comes from Ingrian selkänahka, from Ingrian selkä, from Proto-Finnic selkä, from Proto-Finno-Permic śelkä.

Ancestry of “selkänahkain”, step by step

StepLanguageWordMeaning
1Ingrianselkänahkaback skin
2Ingrianselkäback
3Proto-Finnicselkäback; ridge
4Proto-Finno-Permicśelkä
Every word from Proto-Finno-Permic śelkäEvery word from Proto-Finnic selkäEvery word from Ingrian selkä
selkänahkain — Etymology, Origin & Word History | Etymology Explorer