Cognomen Xio (Xio 
) , in the entire world, is quite a rare family name. The cognomen Xio is habitual in Malaysia, where it is quite a rare surname, Myanmar, where it is a rare surname, and Saudi Arabia, where it is a very rare surname. Not in comparison with a country's population, it is the most numerous in South-eastern Asia, particularly Malaysia, Myanmar, and Indonesia. Very seldom, Xio is the forename as well as the last name.