Cognomen Gjilan (Gjin 
, Gjilan 
) , around the globe, is a rare last name. The cognomen Gjilan is habitual in Albania, where it is quite a rare surname, Serbia, and Switzerland, where it is a rare surname. Not in comparison with a country's population, it is commonest in Serbia, Albania, and the United States. More prevalently, Gjilan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Gjin | Greece, Albania, United States, Myanmar, Italy |
| Gjilan | Serbia, India, Albania, Switzerland |