Where does “haiso” come from?

haiso (Ingrian) comes from Ingrian haissa, from Proto-Finnic haistak — to smell, to stink give off a smell.

Ancestry of “haiso”, step by step

StepLanguageWordMeaning
1Ingrianhaissato smell
2Proto-Finnichaistakto smell, to stink give off a smell
Every word from Proto-Finnic haistak →Every word from Ingrian haissa →