Chlothar (Latin Chlotharius; Greek Khlōthários Χλωθάριος; French Clotaire) is a Germanic given name, attested in Old English as Hloþhere, in Old High German as Lothari (Lothair, Lothar), and reconstructed in Frankish as *Hlodhari.
It means "famous warrior", as a combination of the Germanic root hlut- (lauded, famous) and the word heri (army, warrior).
[1] It can refer to the following kings of the Franks: