Cognomen Chaiyan (ชัยยันต์ 
, ไชยยันต์ , Chaiyan 
) , throughout the world, is a rare family name. The surname Chaiyan is habitual in Thailand, where it is a rare surname, Malaysia, where it is an extremely rare surname, and Germany. Measured by absolute frequency, it is the most numerous in Thailand, China, and India. More frequently, Chaiyan is the forename as well as the last name.
Kamon, Tummakun, Hanchana, Yingyong, Samransuk, Saengkaew, Saenghiran, Chumchana, Kaewchana, Kaewchuen, Khonphian, Kwanthong, Pengjaroon, Ratcharak, Wiangkaew, Sangkharat, Chaithaworn, Chaikranjanasak, Tippayawasri, Sangkhanant, Intharasuwan, Sitthimongkun, Tanmongkhon, Jaruchai, Likkachai, Ratakhan, Pibul, Norat, Merbsri, Saisin, Sukjai, Srisom, Aeidchalerm, Jaiyen, Natcha, Inzaypura, Rattanarangsi, Soonkavong, Koolsak, Paiaree, Pongsao, Phetrat, Rajchagool, Rakbamrung, Rongdach, Siripala, Chouvaparnante, Kongchoo, Aoksornpan, and Watcharaamornsak