Cognomen Mc Lennon (Mc Lennon 
) , all around the world, is a very rare last name. The last name Mc Lennon is characteristic of Latin America and the Caribbean, particularly Saint Lucia, where it is quite a common surname, Costa Rica, where it is a very rare surname, and Honduras. In absolute terms, it is the most numerous in Saint Lucia, the United States, and Canada. Much less frequently, Mc Lennon is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Mc Lennon | Philippines, Saint Lucia, Canada, United States, Costa Rica |