1. (

• Klein ,
• Felix_Klein

) German mathematician who created the Klein bottle (1849-1925) ;

2. (

• Klein ,
• Melanie_Klein

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

3. (

• Klein ,
• Calvin_Klein ,
• Calvin_Richard_Klein

) United States fashion designer noted for understated fashions (born in 1942) ;