Surname Коидо (Koido 
, Коидо) , in all the world, is a very rare last name. The last name Коидо is habitual in Estonia, where it is quite a rare surname, Hong Kong, where it is a rare surname, and Belarus, where it is a very rare surname. Measured by absolute frequency, it is commonest in Hong Kong, Estonia, and China. Much less frequently, Коидо is the forename as well as the last name.