Surname Iusi (Iusi 
, Юси 
) , around the world, is a rare cognomen. The surname Iusi is habitual in Italy, where it is a rare surname, New Zealand, and Canada, where it is a very rare surname. Measured by absolute frequency, it is the most numerous in Italy, the United States, and Brazil. Much less frequently, Iusi is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Iusi | Argentina, Italy, Brazil, United States, Guatemala |
| Юси | Kazakhstan, Russia |