Last name Adayi (Adayi 
) , throughout the world, is quite a rare surname. The cognomen Adayi is characteristic of Sub-Saharan Africa, particularly Togo, where it is quite a rare surname, Ghana, where it is a rare surname, and Nigeria. In absolute terms, it is the most numerous in Nigeria, Ghana, and India. Likewise, Adayi is the forename as well as the last name.