Where does “-ao” come from?

-ao (Finnish) comes from Proto-Finnic -ado, from Proto-Finnic -o, from Proto-Uralic -w.

Ancestry of “-ao”, step by step

StepLanguageWordMeaning
1Proto-Finnic-ado—
2Proto-Finnic-oForms action/result nouns from verbs
3Proto-Uralic-w—

Words derived from “-ao”

Every word from Proto-Uralic -w →Every word from Proto-Finnic -o →Every word from Proto-Finnic -ado →