Last name จันทร์ทุ่งใหญ่ (จันทร์ทุ่งใหญ่, Jantungyai 
) , all around the world, is a very rare cognomen. The family name จันทร์ทุ่งใหญ่ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Jantungyai | Thailand |