Where does “lavvantaki” come from?

lavvantaki (Ingrian) comes from Finnish lauantai, from Old Norse laugardagr, from Old Norse laug, from Proto-Germanic laugō, from Proto-Indo-European lewh₃- — to wash.

Ancestry of “lavvantaki”, step by step

StepLanguageWordMeaning
1FinnishlauantaiSaturday
2Old NorselaugardagrSaturday
3Old Norselaugbath; hot spring; first-person singular past...
4Proto-Germaniclaugōbath, wash; soap, lye
5Proto-Indo-Europeanlewh₃-to wash
Every word from Proto-Indo-European lewh₃-Every word from Proto-Germanic laugōEvery word from Old Norse laug