Where does “vierastupa” come from?

vierastupa (Finnish) comes from Finnish tupa, from Proto-Finno-Ugric *tupa, from Icelandic stofa, from Old Norse stofa, from German stōve, from Old Saxon *stova, from Proto-West Germanic *stobu.

vierastupa (Finnish): guesthouse, guest room especially in traditional Finnish farmhouses

Definitions

guesthouse, guest room especially in traditional Finnish farmhouses

Ancestry of “vierastupa”, step by step

vierastupa traces back through two separate lines of ancestry.

via Finnish tupa

Step	Language	Word	Meaning
1	Finnish	tupa	living room, main room; cottage, cot; room
2	Proto-Finno-Ugric	*tupa	—
3	Icelandic	stofa	a living room; a classroom, a room
4	Old Norse	stofa	room, living room
5	German	stōve	—
6	Old Saxon	*stova	—
7	Proto-West Germanic	*stobu	—

via Finnish vieras

Step	Language	Word	Meaning
1	Finnish	vieras	unfamiliar; foreign; guest, visitor
2	Proto-Finnic	veeras	guest, visitor; stranger; strange, foreign,...
3	Proto-Finnic	veeri	side, flank; edge
4	Proto-Finno-Permic	wäre	—

Every word from Proto-West Germanic *stobu →Every word from Old Saxon *stova →Every word from German stōve →