Where does “貝桑松” come from?

貝桑松 (Chinese) comes from French Besançon, from Latin Vesontio, from Proto-Celtic ves, from Proto-Indo-European wers-, from Proto-Indo-European wer- — to burn; to cover, heed, notice; squirrel.

Ancestry of “貝桑松”, step by step

Step	Language	Word	Meaning
1	French	Besançon	—
2	Latin	Vesontio	—
3	Proto-Celtic	ves	mountain
4	Proto-Indo-European	wers-	to wipe; peak, height
5	Proto-Indo-European	wer-	to burn; to cover, heed, notice; squirrel

Every word from Proto-Indo-European wer- →Every word from Proto-Indo-European wers- →Every word from Proto-Celtic ves →