Where does “Tyyne” come from?

Tyyne (Finnish) comes from Finnish Tyyni, from Proto-Finnic *tüüni, from Proto-Finno-Ugric tiwä-ni.

Ancestry of “Tyyne”, step by step

Step	Language	Word	Meaning
1	Finnish	Tyyni	—
2	Proto-Finnic	*tüüni	—
3	Proto-Finno-Ugric	tiwä-ni	—