Surname Caulay (Caulay 
) , throughout the world, is a very rare family name. The surname Caulay is habitual in France, where it is a very rare surname, Philippines, and the United Kingdom, where it is an extremely rare surname. Much less frequently, Caulay is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Caulay | Philippines, India, France, United States, United Kingdom |