Surname Caoi (Caoi 
) , around the globe, is a very rare family name. The last name Caoi is characteristic of Philippines, where it is a very rare surname, Malaysia, where it is an extremely rare surname, and Argentina. Also, Caoi is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Caoi | China, Malaysia, Philippines, United States, Argentina |