Family name นิโรจ (Niroj 
, นิโรจ , Nirooj ) , worldwide, is quite a rare cognomen. The last name นิโรจ is characteristic of Nepal, where it is quite a rare surname, Sri Lanka, where it is a rare surname, and Thailand. In absolute terms, it most frequently occurs in Nepal, India, and Thailand. More prevalently, นิโรจ is the forename as well as the last name.