Cognomen יאה (Iwa 
, יאה 
) , worldwide, is quite a common surname. The cognomen יאה is characteristic of the Democratic Republic of the Congo, where it is quite a rare surname, Papua New Guinea, and Japan, where it is a rare surname. Measured by absolute frequency, it is the most numerous in the Democratic Republic of the Congo, Japan, and Indonesia. Predominantly, יאה is the forename as well as the last name.