Family name Mariro (Mariro 
) , worldwide, is a rare surname. The cognomen Mariro is habitual in Sub-Saharan Africa, particularly Zimbabwe, where it is a rare surname, Tanzania, and South Africa, where it is an extremely rare surname. In absolute terms, this name is the most popular in Sub-Saharan Africa, particularly Zimbabwe, Tanzania, and Nigeria. Much less frequently, Mariro is the forename as well as the last name.