Cognomen Naiyapak (Naiyapak 
) , in the world, is an extremely rare surname. Much more frequently, Naiyapak is the forename as well as the last name.
Imsai, Rojanasakul, Nareawuttikun, Thipsuwan, Phakkahn, Sukchuai, Hongrat, Narknoi, Narewuttikun, Naraewuttikun, Naraewuttikul, Boondee, Chaipan, Saensri, Maoleewerakul, Tadsuwan, Jaihow, Jaihao, Wongmueangdae, and Rattanapinunchai