Cognomen Sihak (Sihak 
) , all over the world, is a rare surname. The last name Sihak is habitual in Malaysia, where it is a very rare surname, Indonesia, and Canada, where it is an extremely rare surname. Not in comparison with a country's population, it is commonest in Indonesia, Malaysia, and India. Likewise, Sihak is the forename as well as the last name.