Louis m. Old High German hlūt, lūt, Old Saxon hlūd from Proto-Germanic *hlūdaz, *hlūþaz 'loud; famous, renowned' + Old Saxon, Old English wig, Old High German wīc 'war, battle'.
The name of several early kings of Frankish tribes, three 9th C kings of the Franks, two 9th C kings of Italy and Roman Emperors, two 13th C French saints, a 14th C Holy Roman Emperor, twelve medieval kings of France, a 14th C king of Hungary and Poland, and a 16th C king of Bohemia and Hungary.