Last name Njia (Njia 
) , worldwide, is a rare family name. The cognomen Njia is characteristic of Cameroon, where it is quite a rare surname, Tanzania, where it is a rare surname, and France, where it is an extremely rare surname. Measured by absolute frequency, it is the most numerous in Sub-Saharan Africa, particularly Cameroon, Tanzania, and Nigeria. Very seldom, Njia is the forename as well as the last name.