Family name Okuba (Okuba 
) , all around the world, is a rare cognomen. The surname Okuba is characteristic of Nigeria, where it is a rare surname, Israel, where it is a very rare surname, and Brazil, where it is an extremely rare surname. Not in comparison with a country's population, it is the most numerous in Nigeria, Brazil, and the United Kingdom. Likewise, Okuba is the forename as well as the last name.