Nama " Louis" Berasal dari nama Latin : Ludovikus yang berarti : "Kesatria"
Louis, Loïc, Ludovic (French), Lewis (English), Lodewijk (Dutch), Chlodovech, Clodovicus, Ludovicus, Clovis, Hludowig (Ancient Germanic), Koldobika, Koldo (Basque), Loïc (Breton), Lluís (Catalan), Alojz, Alojzije (Croatian), Alois, Ludvík, Luděk (Czech), Ludvig (Danish), Ludoviko, Luĉjo (Esperanto), Lois (Galician), Alois, Aloysius, Ludwig, Lutz (German), Alajos, Lajos (Hungarian), Lúðvík (Icelandic), Alaois (Irish), Alvise, Lodovico, Ludovico, Luigi, Gino, Luigino, Vico (Italian), Ludis, Ludvigs (Latvian), Liudvikas (Lithuanian), Aloys, Aloysius (Medieval Occitan), Ludvig (Norwegian), Loís (Occitan), Alojzy, Ludwik (Polish), Aloisio, Luís, Luisinho (Portuguese), Luiz (Portuguese (Brazilian)), Alojz (Slovak), Alojz, Alojzij, Ludvik, Lojze (Slovene), Luis, Lucho (Spanish), Ludvig, Ludde (Swedish)
BENTUK FEMINIM : Louise (French), Louisa, Louise (English), Loes, Louisa, Louise (Dutch)