Last name Sâo (Сяо 
, Sâo) , across the world, is a rare surname. The surname Sâo is habitual in Kazakhstan, where it is a rare surname, Kyrgyzstan, and Belarus, where it is a very rare surname. Not in comparison with a country's population, it most frequently occurs in Russia, Kazakhstan, and Ukraine. Also, Sâo is the forename as well as the last name.