1610s, from German lübisch, Dutch lubeksch, from Lübeck, Hanseatic city in northern Germany, formerly a trade center, hence its use as an adjective in English. The city was founded 1143 and is said to be named for the former principality of the Liubichi, literally "the people of prince Liub" (literally "beloved").
[Lubish etymology, Lubish origin, 英语词源]