Chlothar (Latin Chlotharius; French Clotaire) is a Germanic given name, which evolved into the later form Lothair (Lotharius).
Upon his father's death, Theudebert had to fight both his uncles Childebert and Clotaire to inherit his father's kingdom.
When Clotaire then became sole king of the Franks, he left Warnachar in power in Austrasia briefly, but confirmed at Bonneuil-sur-Marne, in 617, Warnachar's function in Burgundy until his death in 626 (or 627 or 628, when he is said to have called a synod of Burgundian bishops).