Definitions of Klein:

• noun:   United States fashion designer noted for understated fashions (born in 1942)
• noun:   United States psychoanalyst (born in Austria) who was the first to specialize in the psychoanalysis of small children (1882-1960)
• noun:   German mathematician who created the Klein bottle (1849-1925)
• name:  A surname (common: 1 in 3846 families; popularity rank in the U.S.: #436)