Cognomen ปฐมกาล (ปฐมกาล , Pratomkarn ) , across the world, is an extremely rare family name. Much more frequently, ปฐมกาล is the forename as well as the last name.
Prathomkarn
ปัญญาตระกูล, and จันทร์อุทัย
, Pratomkarn