Surname Seidin (Сейдин 
, Seidin 
) , worldwide, is a very rare last name. The last name Seidin is habitual in Kyrgyzstan, where it is a rare surname, Estonia, and Kazakhstan, where it is a very rare surname. Not in comparison with a country's population, it most frequently occurs in Kyrgyzstan, Kazakhstan, and Honduras. More prevalently, Seidin is the forename as well as the last name.