Surname Оока (Ooka 
, Оока) , in all the world, is quite a rare family name. The last name Оока is characteristic of Guam, where it is quite a common surname, Egypt, where it is a rare surname, and South Africa, where it is a very rare surname. In absolute terms, it is commonest in Egypt, the United States, and Guam. Also, Оока is the forename as well as the last name.