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Family name Thoa (Thoa , Тхоа ) , in the world, is a common cognomen. The last name Thoa is habitual in Vietnam, where it is quite a common surname, Macao, where it is quite a rare surname, and Malaysia. Not in comparison with a country's population, it is the most numerous in Vietnam, Malaysia, and Papua New Guinea. Much less frequently, Thoa is the forename as well as the last name.