Koum is a surname. Notable people with the surname include: * Daniel Koum (born 1985), Cameroon-born Australian weightlifter * Emmanuel Koum (1946–2008), Cameroonian football player *

Jan Koum Jan Borysovych Koum (born February 24, 1976) is a Ukrainian-American billionaire businessman and computer programmer. He is the co-founder and former CEO of WhatsApp, a mobile messaging app which was acquired by Facebook in 2014 for US$19.3 bil ...

(born 1976), CEO and founder of WhatsApp

See also