Where does “Claire” come from?

Claire (French) comes from Latin clara, from Latin clarus, from Proto-Italic klāzos, from Proto-Indo-European kelh₁- — to call, cry, summon.

Ancestry of “Claire”, step by step

Step	Language	Word	Meaning
1	Latin	clara	inflection of clārus: ## nominative/vocative...
2	Latin	clarus	clear, bright; renowned, famous; upstanding,...
3	Proto-Italic	klāzos	—
4	Proto-Indo-European	kelh₁-	to call, cry, summon