Last name Okii (Okii 
, Окии) , worldwide, is quite a rare cognomen. The family name Okii is characteristic of Japan, where it is quite a rare surname, Uganda, where it is a rare surname, and Tanzania, where it is a very rare surname. Not in comparison with a country's population, it is commonest in Japan, Uganda, and Nigeria. Much less frequently, Okii is the forename as well as the last name.