Where does “pikipäin” come from?

pikipäin (Finnish) comes from Finnish päin, from Finnish pää, from Proto-Finnic pää, from Proto-Uralic päŋe — head.

Ancestry of “pikipäin”, step by step

StepLanguageWordMeaning
1Finnishpäinagainst, to, on etc; Used to indicate approximate...
2Finnishpäähead; end, tip
3Proto-Finnicpäähead
4Proto-Uralicpäŋehead
Every word from Proto-Uralic päŋe →Every word from Proto-Finnic pää →Every word from Finnish pää →