Surname Hiak (Hiak 
, เฮียก) , worldwide, is a rare last name. The last name Hiak is characteristic of South-eastern Asia, particularly Malaysia, where it is a rare surname, Singapore, where it is a very rare surname, and Myanmar. Not in comparison with a country's population, this name is the most popular in Malaysia, Myanmar, and China. Much less frequently, Hiak is the forename as well as the last name.