Cognomen กันยายน (Sept 
, Sepha 
, กันยายน ) , across the world, is quite a rare surname. The family name กันยายน is habitual in Brunei, where it is quite a rare surname, Algeria, where it is a rare surname, and Cameroon. Not in comparison with a country's population, the name is most common in Indonesia, India, and Germany. Also, กันยายน is the forename as well as the last name.