Louis Look up Louis at Dictionary.com
masc. proper name, from French Louis, from Old French Loois, probably via Medieval Latin Ludovicus, a Latinization of Old High German Hluodowig, literally "famous in war" (cognate with Clovis; for etymology see Ludwig).

As the name of a French gold coin 17c.-18c., short for Louis d'or, from the French kings of that name (originally Louis XIII) pictured on the coins. Louis-Quatorze (1855) refers to styles reminiscent of the time of King Louis XIV of France (1643-1715).