Worldwide, Doin (Doin 
, دوين 
, Доин 
) is a rare dominantly boy's, but infrequently feminine forename. The forename Doin is characteristic of Japan, where it is a rare boy's name, the United States, where it is an extremely rare dominantly male, but seldom feminine name, and India, where it is an extremely rare epicene name. More prevalently, Doin is the last name as well as the forename.