Last name لويسى (Luisi 
, Loisy 
, لويسى) , across the world, is quite a common surname. The family name لويسى is habitual in Italy, where it is quite a rare surname, Luxembourg, and France. Not in comparison with a country's population, it is commonest in Italy, France, and the United States. Very seldom, لويسى is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Luisi | Argentina, Brazil, France, Italy, United States |
| Loisy | Spain, Brazil, France, India, United States |