Surname Karatu (Karatu 
) , all over the world, is quite a rare cognomen. The surname Karatu is characteristic of Sub-Saharan Africa, particularly Kenya, where it is quite a rare surname, Nigeria, where it is a rare surname, and Tanzania. Not in comparison with a country's population, it is commonest in Kenya, Nigeria, and Indonesia. Likewise, Karatu is the forename as well as the last name.