Cognomen Kidao (Kidao 
) , across the world, is a very rare surname. The surname Kidao is habitual in Philippines, where it is a very rare surname, the United Kingdom, where it is an extremely rare surname, and Canada. Not in comparison with a country's population, the name is most common in Philippines, India, and the United Kingdom. Very seldom, Kidao is the forename as well as the last name.