Surname Олусегун (Olusegun 
, Олусегун 
) , in all the world, is a widespread cognomen. The family name Олусегун is habitual in Nigeria, where it is quite a common surname, Niger, where it is quite a rare surname, and Iceland. Not in comparison with a country's population, it is commonest in Sub-Saharan Africa, particularly Nigeria, Niger, and Benin. Likewise, Олусегун is the forename as well as the last name.