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In all the world, Thach (Thach , Thạch ) is quite a common principally masculine, but very seldom female first name. The forename Thach is habitual in Vietnam, where it is quite a rare predominantly boy's, but scarcely female name, Australia, where it is a rare epicene name, and the United States, where it is a rare principally boy's, but scarcely feminine name. Not in comparison with a country's population, the name is most common in Vietnam, the United States, and China. Also, Thach is the last name as well as the forename.
Thach is also a name for the fictitious and mythical characters: .