Cognomen Allenn (Allenn 
) , in all the world, is a very rare family name. The cognomen Allenn is characteristic of New Zealand, where it is a very rare surname, the United Kingdom, where it is an extremely rare surname, and the United States. In absolute terms, it most frequently occurs in the United States, the United Kingdom, and India. Also, Allenn is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Allenn | Philippines, Singapore, United Kingdom, United States, India |