Surname ลิ้นแก้ว (ลิ้นแก้ว, Klingaew, Tongkeaw 
) , throughout the world, is a rare last name. The cognomen ลิ้นแก้ว is characteristic of Thailand, where it is a rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Tongkeaw | United States, Thailand |
| Tonggaew | Thailand |