Lou is a shortened form of the name Louis, which means "renowned warrior." Some synonyms for Lou include Lewis, Luigi, Ludovic, and Alois. Lewis is the English form of Louis, while Luigi is the Italian version and Ludovic is the French variant. Alois is the Germanic form of Louis. Other names that have similar meanings to Lou include Arnold, Conrad, and Valentin. All of these names have roots in various languages, but they all share the common meaning of strength and courage. Whether you prefer Lou or one of its many synonyms, these names are a tribute to the noble spirit of a warrior.