Lothario
masc. proper name, Italian form of Old High German Hlothari, Hludher (whence German Luther, French Lothaire), literally "famous warrior," from Old High German lut (see loud) + heri "host, army" (see harry (v.)). As a characteristic name for a lady-killer, 1756, from the name of the principal male character of Nicholas Rowe's "The Fair Penitent" (1703).