Where does “vappupäivä” come from?

vappupäivä (Finnish) comes from Finnish Vappu, from Finnish Valpuri, from German Walpurga, from Old High German Waltburg, from Old High German burg, from Proto-West Germanic burg, from Proto-Germanic burgz, from Proto-Indo-European bʰr̥ǵʰ-.

Ancestry of “vappupäivä”, step by step

vappupäivä traces back through two separate lines of ancestry.

via Finnish Vappu

StepLanguageWordMeaning
1FinnishVappuMay Day, Labor Day, Walpurgis night 1st of May; in Finland, a highly joyous, festive occasion, especially among the working class and students
2FinnishValpuri
3GermanWalpurgaan eighth century saint whose feast day on May 1st coincided with a pagan feast associated in folklore with witchcraft
4Old High GermanWaltburg
5Old High Germanburga castle; a city
6Proto-West Germanicburgfortification; city
7Proto-Germanicburgzfortification, stronghold; city
8Proto-Indo-Europeanbʰr̥ǵʰ-

via Finnish päivä

StepLanguageWordMeaning
1Finnishpäiväday; the sun
2Proto-Finnicpäiväsun; day
3Proto-Uralicpäjwä? warmth; ? sun; ? fire
4Proto-Uralicpäje
Every word from Proto-Indo-European bʰr̥ǵʰ-Every word from Proto-Germanic burgzEvery word from Proto-West Germanic burg