1. (noun) German mathematician who created the Klein bottle (1849-1925)

• felix klein

2. (noun) United States psychoanalyst (born in Austria) who was the first to specialize in the psychoanalysis of small children (1882-1960)

• melanie klein

3. (noun) United States fashion designer noted for understated fashions (born in 1942)

• calvin klein
• calvin richard klein