Worldwide, Trehan (Trehan 
) is a rare principally male, but very seldom female given name. The forename Trehan is characteristic of Sri Lanka, where it is a rare boy's name, India, where it is an extremely rare principally boy's, but very seldom feminine name, and China, where it is an extremely rare epicene name. Much more prevalently, Trehan is the last name as well as the forename.