Cognomen จันทรไพโรจน์ (จันทรไพโรจน์ 
, Jantarakairoj 
) , all around the world, is a very rare surname. The last name จันทรไพโรจน์ is characteristic of Thailand, where it is a very rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| จันทรไพโรจน์ | Thailand |
| Jantarakairoj | United States, Thailand |