Surname Kidai (Kidai 
, Кидаи, Кидай 
) , all over the world, is a rare family name. The cognomen Kidai is characteristic of Tanzania, where it is a rare surname, Morocco, and Ukraine, where it is a very rare surname. In absolute terms, the name is most common in Tanzania, Morocco, and Russia. Also, Kidai is the forename as well as the last name.