Cognomen เลิศบุญ (เลิศบุญ 
, Lertboon , Lerdboon 
) , in the entire world, is a very rare family name. The cognomen เลิศบุญ is characteristic of Thailand, where it is a very rare surname, and the United States, where it is an extremely rare surname. Likewise, เลิศบุญ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| เลิศบุญ, Lertboon | Thailand |
| Lerdboon | Thailand, United States |