Where does “souhait” come from?

souhait (French) comes from French souhaiter, from Old French sohaidier, from Vulgar Latin *subhaitare, from Latin subtus, from Latin sub, from Proto-Italic supo, from Proto-Indo-European upó, from Proto-Indo-European h₃ewp-.

souhait (French): wish

Definitions

wish

Ancestry of “souhait”, step by step

Step	Language	Word	Meaning
1	French	souhaiter	to wish (for); to hope (for)
2	Old French	sohaidier	to wish
3	Vulgar Latin	*subhaitare	—
4	Latin	subtus	below, underneath, beneath
5	Latin	sub	under, beneath; behind; at the feet of
6	Proto-Italic	supo	under
7	Proto-Indo-European	upó	under, below
8	Proto-Indo-European	h₃ewp-	—

Every word from Proto-Indo-European h₃ewp- →Every word from Proto-Indo-European upó →Every word from Proto-Italic supo →