Áo is Mandarin pinyin and Wade–Giles romanization of the Chinese surname written 敖 in Chinese character.
Ao is listed 375th in the Song dynasty classic text Hundred Family Surnames.
[1] As of 2008, it is the 261st most common surname in China, shared by 250,000 people.
[2] In Japanese, Ao is Japanese surname written 粟生 in Chinese character.
In Chinese mythology, the Dragon Kings of the Four Seas are surnamed Ao: