Cognomen 洛伊 (Loy 
, 洛伊 
, Lowy 
) , across the world, is a common surname. The last name 洛伊 is characteristic of British Virgin Islands, where it is quite a common surname, Malaysia, and Singapore (explore the name in all countries). Not in comparison with a country's population, this name is the most popular in Malaysia, the United States, and Germany. Very seldom, 洛伊 is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Loy | Germany, Malaysia, Singapore, United States, Tanzania |
| 洛伊 | China |
| Lowy | Germany, Malaysia, Australia, United States, France |
| Loewy | Germany, Indonesia, Australia, United States, France |