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 śelkä →Every word from Proto-Finnic selkä →Every word from Ingrian selkä →