Where does “وان” come from?

وان (Ottoman Turkish) comes from Armenian Վան, from Old Armenian վան, from Parthian vān-, from Old Iranian wāhana-.

Ancestry of “وان”, step by step

Step	Language	Word	Meaning
1	Armenian	Վան	—
2	Old Armenian	վան	lodging, dwelling, home, habitation, abode;...
3	Parthian	vān-	—
4	Old Iranian	wāhana-	—