Lothar m. Old High German hlūt, lūt, Old Saxon hlūd from Proto-Germanic *hlūdaz, *hlūþaz 'loud; famous, renowned' + Old High German heri 'host, army'..
The name of a 6th C king of the Franks, two 7th C kings of the Franks, an 8th C king of the Franks, a 9th C Holy Roman Emperor and king of Italy, a 9th C king of Lotharingia, a 10th C king of Italy, a 10th C king of the Franks, and a 12th C Holy Roman Emperor.
The name was sometimes conflated with Luther.