Surname Prachongsai (Prachongsai 
) , in the world, is a rare cognomen. The last name Prachongsai is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname.
Issara, Sirilak, Phichet, Dussadee, Thanawut, Napaphat, Kanokkorn, Puchareeporn, Thiraphon, Kotchaphat, Pattarawan, Damrongsak, Thammarong, Wutthipong, and Chotchanitpong