Family name Rattanakay (Rattanakay 
) , worldwide, is a very rare cognomen. The surname Rattanakay is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Rattanakay | Thailand |
La Or, Sakchai, Sirirat, Kannika, Pongwat, Thichakorn, Saengthong, and Napatsanan