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Surname นิโรจน์ (Niroj , นิโรจน์ , Nirot ) , worldwide, is quite a rare last name. The last name นิโรจน์ is habitual in Nepal, where it is quite a rare surname, Thailand, and Sri Lanka, where it is a rare surname. Measured by absolute frequency, it is commonest in Thailand, Nepal, and India. More frequently, นิโรจน์ is the forename as well as the last name.