Cognomen Demedeiros (Demedeiros 
) , globally, is a rare last name. The last name Demedeiros is characteristic of Canada, where it is a rare surname, New Zealand, and the United States. In absolute terms, this name is the most popular in the United States, Canada, and Brazil. Much less frequently, Demedeiros is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Demedeiros | Canada, France, Brazil, New Zealand, United States |