Where does “virvonta” come from?

virvonta (Finnish) comes from Finnish virpoa, from Finnish -öä, from Proto-Finnic -odak, from Proto-Uralic -w-.

virvonta (Finnish): wishing another person health and happiness on Palm Sunday by tapping them lightly with a willow twig and chanting a rhyme; nowadays especially done door-to-door by children disguised as witches in order to get candy from people