Cognomen Lagrandeur (Lagrandeur 
) , all around the world, is a rare family name. The last name Lagrandeur is habitual in Mauritius, where it is quite a rare surname, Canada, where it is a rare surname, and New Zealand. In absolute terms, this name is the most popular in the United States, Canada, and France.
| VARIANT | COUNTRY |
|---|---|
| Lagrandeur | Canada, France, New Zealand, United States, Mauritius |