Family name ดุลยกาญจน์ (ดุลยกาญจน์ 
, Dulyakarn 
) , across the world, is a rare cognomen. The family name ดุลยกาญจน์ is characteristic of Thailand, where it is a rare surname, and Australia, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| ดุลยกาญจน์ | Thailand |
| Dulyakarn | Australia, Thailand |