Cao is a Vietnamese surname. The name is transliterated as Gao in Chinese and Go in Korean. It is unrelated to the Chinese surname Cao, which is transliterated as Tào in Vietnamese.
List of persons with the surname
Cao Lỗ, weaponry engineer and minister Cao Bá Quát, poet and revolutionary Cao Thắng, bandit-turned-anticolonial fighter Cao Xuân Dục, scholar, historian-mandarin, and court adviser Cao Văn Lầu, musician Cao Văn Viên, General in the Army of the Republic of Vietnam (ARVN) Đoan Trang (Cao Thị Đoan Trang), singer Joseph Cao, lawyer, former US representative from Louisiana Hung Cao, Vietnamese-American government official and retired United States Navy officer