Where does “käyvyys” come from?

käyvyys (Finnish) comes from Finnish käyvä, from Finnish -sti, from Proto-Finnic -stik — Forms adverbs of manner from adjectives.

Ancestry of “käyvyys”, step by step

StepLanguageWordMeaning
1FinnishkäyväPresent active participle of käydä
2Finnish-stiForms adverbs describing how many times something...
3Proto-Finnic-stikForms adverbs of manner from adjectives
Every word from Proto-Finnic -stik →Every word from Finnish -sti →Every word from Finnish käyvä →