Where does “Una” come from?

Una (Latvian) comes from Latin ūna, from Latin hōra, from Ancient Greek ὥρα, from Proto-Hellenic *worā, from Proto-Indo-European wēr-, from Proto-Indo-European wer- — to burn; to cover, heed, notice; squirrel.

Ancestry of “Una”, step by step

Step	Language	Word	Meaning
1	Latin	ūna	together, simultaneously, at the same time
2	Latin	hōra	hour
3	Ancient Greek	ὥρα	any defined period of time; season; climate
4	Proto-Hellenic	*worā	—
5	Proto-Indo-European	wēr-	true
6	Proto-Indo-European	wer-	to burn; to cover, heed, notice; squirrel

Every word from Proto-Indo-European wer- →Every word from Proto-Indo-European wēr- →Every word from Proto-Hellenic *worā →