Globally, Niyomtham (Niyomtham 
) is an extremely rare unknown gender forename. Predominantly, Niyomtham is the last name as well as the forename.
Amon, Puchong, Latisha, Nantana, Onanong, Sutthisa, Anchalee, Chawalit, Kusawadee, Krittiya, Penpicha, Jeerawit, Thidarat, Natthaya, Nanthaya, Waraporn, Waewwalee, Witchana, Yongyuth, Sudhathai, Chittakon, Pongpisut, Piyawat, Pisinee, Porntip, Penwadee, Erin, Santi, Athit, Chawi, Orasa, Waree, Wasan, Bundid, Kantee, Nathan, Thaksaporn, Onhathai, Surasak, Suriyan, Supicha, Sudarat, Suwanee, Sornsak, Sripare, Assawin, Chalita, Paveena, Mananya, and Natthawut