Louis
来自Big Physics
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from Louis.
wiktionary
Borrowed from French louis, from Louis, the name of the French kings who first issued these coins and whose images appeared on their obverses.
etymonline
Louis
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).
