凯山·丰威汉
Kaysone was born Nguyễn Cai Song (although he also used the name Nguyễn Trí Mưu for a short period in the 1930s) in Na Seng village, Khanthabouli district, French Indochina (now Kaysone Phomvihane District, Savannakhet Province, Laos). His father, Nguyễn Trí Loan, was Vietnamese and his mother, Nang Dok, was Lao. He had two sisters: Nang Souvanthong, living in Thailand, and Nang Kongmany, who lived in the USA.