Cognomen Mc Clain (Mc Clain 
) , in all the world, is a rare family name. The surname Mc Clain is characteristic of the United States, where it is a rare surname, Canada, and Costa Rica, where it is a very rare surname. Not in comparison with a country's population, this name is the most popular in the United States, Canada, and Germany. Much less frequently, Mc Clain is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Mc Clain | Germany, Costa Rica, Philippines, United States, Canada |