Where does “aisannahka” come from?

aisannahka (Ingrian) comes from Ingrian aisa, from Proto-Finnic aisa, from Proto-Indo-European h₂oyHsos.

Ancestry of “aisannahka”, step by step

aisannahka traces back through two separate lines of ancestry.

via Ingrian aisa

StepLanguageWordMeaning
1Ingrianaisashaft
2Proto-Finnicaisashaft, thill
3Proto-Indo-Europeanh₂oyHsos—

via Ingrian nahka

StepLanguageWordMeaning
1Ingriannahkaleather
2Proto-Germanicnaskasoft leather
Every word from Proto-Indo-European h₂oyHsos →Every word from Proto-Finnic aisa →Every word from Ingrian aisa →