Family name I-J (I-J 
) , around the world, is an extremely rare cognomen. The surname I-J is habitual in France, where it is an extremely rare surname, Spain, and the United Kingdom. Likewise, I-J is the forename as well as the last name. Parts of the name also exists independently as a first name I, and a first name J.
| VARIANT | COUNTRY |
|---|---|
| I-J | Canada, Philippines, France, Spain, United Kingdom |