Surname ปากน้ำ (Innam 
, Sapnam 
, Paknam 
) , across the world, is a rare cognomen. The surname ปากน้ำ is characteristic of Thailand, where it is a very rare surname, Myanmar, and Iran. In absolute terms, it is commonest in India, Thailand, and Indonesia. More frequently, ปากน้ำ is the forename as well as the last name.