Kloos is a surname. Notable people with the surname include: Basina Kloos (born 1940), German nun. Cornelis Kloos (1895-1976), Dutch painter. Elimar Kloos (1908–1991), German boxer. Justin Kloos (born 1993), American ice hockey player. Marko Kloos, German author. Rick Kloos, (born 1966), American politician. Willem Kloos (1859–1938), Dutch poet and literary critic. See also. Kroos https://en.wikipedia.org/wiki/Kloos