Family name オトオ (Otoo 
, オトオ ) , in the world, is a common cognomen. The cognomen オトオ is characteristic of Ghana, where it is a common surname, Aland Islands, where it is quite a common surname, and Qatar, where it is quite a rare surname. Not in comparison with a country's population, this name is the most popular in Ghana, the United States, and the United Kingdom. Much less frequently, オトオ is the forename as well as the last name.