Surname Байиса (Bayisa 
, Байиса 
) , in the entire world, is a common last name. The cognomen Байиса is characteristic of Ethiopia, where it is quite a common surname, Lebanon, where it is a rare surname, and United Arab Emirates. In absolute terms, it most frequently occurs in Ethiopia, Lebanon, and South Africa. More frequently, Байиса is the forename as well as the last name.