Cognomen Gre (Grey 
, Gre 
, Gradus 
) , all over the world, is a common family name. The cognomen Gre is characteristic of Jamaica, where it is quite a common surname, Saint Kitts and Nevis, and Guernsey (explore the name in all countries). In absolute terms, this name is the most popular in the United States, the United Kingdom, and Australia. Very seldom, Gre is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Grey | Australia, Jamaica, United Kingdom, United States, Indonesia |
| Gre | Australia, United Kingdom, United States, Indonesia, Democratic Republic of the Congo |
| Gradus | Canada, France, United Kingdom, United States, Indonesia |
| Gré | France, Argentina, Brazil, United States, Netherlands |