Surname Hiamhan (Hiamhan 
) , worldwide, is a rare cognomen. The cognomen Hiamhan is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname.
Don, Panu, Huan, Sayan, Shanya, Pattana, Phichit, Panomwan, Panomvan, Ramphueng, Pitchayapa, Kamonchanok, and Autchariyawan