Cognomen Ocain (Ocain 
) , all around the world, is a rare family name. The cognomen Ocain is characteristic of the United States, where it is a rare surname, New Zealand, where it is a very rare surname, and the United Kingdom, where it is an extremely rare surname. In absolute terms, it is the most numerous in the United States, the United Kingdom, and Philippines. Very seldom, Ocain is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ocain | Philippines, New Zealand, United Kingdom, United States, Mexico |