People whose family name is or was Kahn include

• Albert Kahn -- French banker
• Albert Kahn -- American industrial architect
• Ashley Kahn -- American jazz historian
• Barbara B. Kahn -- researcher at Joslin Diabetes Center
• C. Ronald Kahn -- head researcher at Joslin Diabetes Center
• Gus Kahn -- musician and songwriter
• Gustave Kahn -- French poet
• Herman Kahn -- American futurologist
• Louis Kahn -- architect
• Madeline Kahn -- American actress
• Oliver Kahn -- German footballer
• Otto Hermann Kahn -- banker and patron of the arts
• Philippe Kahn -- French-born entrepreneur
• Robert E. Kahn -- ARPANET (see also History of the Internet)
• Roger Wolfe Kahn -- jazz musician

Incidentally, Kahn is also the German word for a small boat.