Family name จันทร์กระจ่าง (จันทร์กระจ่าง, Janjaeng 
, Chankrajang ) , in all the world, is a rare cognomen. The last name จันทร์กระจ่าง is characteristic of Thailand, where it is quite a rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Janjaeng, Chankrajang | Thailand |
| Chankrachang | United States, Thailand |
Chanchalaem, Chanchambang, Chancharastong, Chandrkrachang, Chankachang, Chankhrajhang, Chankrachangchang, Chankrajai, Chanraeng, Chanrawang, Chantrachambang, Choungkrajang, Janchaeng, Janchalaem, Janjarang, Jankaeng, Jankrajarng, Janraung, Janrawang, and Junjankhao