Cognomen 角井 (Kakui 
, 角井 , Кадои 
) , throughout the world, is a rare last name. The surname 角井 is characteristic of Kenya, where it is quite a rare surname, Armenia, where it is a rare surname, and New Zealand, where it is a very rare surname. Not in comparison with a country's population, it is commonest in Kenya, Armenia, and India. Likewise, 角井 is the forename as well as the last name.