Family name พนาสนธิ์ (พนาสนธิ์ 
) , across the world, is a very rare cognomen. The last name พนาสนธิ์ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. More frequently, พนาสนธิ์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| พนาสนธิ์ | Thailand |