Family name Loisi (Loisi 
) , around the world, is a rare cognomen. The last name Loisi is habitual in Italy, where it is a rare surname, Argentina, and Switzerland. Not in comparison with a country's population, it is commonest in Italy, Argentina, and the United States. Likewise, Loisi is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Loisi | Italy, United States, Peru, Tanzania, Argentina |