Surname غايوس (Gaius 
, غايوس) , in all the world, is quite a common cognomen. The cognomen غايوس is habitual in Papua New Guinea, where it is quite a rare surname, Gambia, and Nigeria. Measured by absolute frequency, it is commonest in Nigeria, Papua New Guinea, and Cameroon. Also, غايوس is the forename as well as the last name.