Where does “heinäsikkö” come from?

heinäsikkö (Ingrian) comes from Ingrian -kko, from Proto-Finnic -kkoi — Forms diminutive nouns.

Ancestry of “heinäsikkö”, step by step

StepLanguageWordMeaning
1Ingrian-kkoUsed to form collective nouns
2Proto-Finnic-kkoiForms diminutive nouns
Every word from Proto-Finnic -kkoi →Every word from Ingrian -kko →