Family name Баю (Bayu 
, Baju 
, Баю 
) , in the world, is a widespread cognomen. The family name Баю is characteristic of Indonesia, where it is quite a common surname, Ethiopia, and Brunei, where it is quite a rare surname. Not in comparison with a country's population, the name is most common in Indonesia, Ethiopia, and India. More prevalently, Баю is the forename as well as the last name.