Across the world, ณฐวรรธก์ (ณฐวรรธก์ 
) is a very rare male first name. The first name ณฐวรรธก์ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare masculine name.
| VARIANT | COUNTRY |
|---|---|
| ณฐวรรธก์ | Thailand |
วิถุนัด, บุญเรือน, and รัตนชัยสิทธิ์