Last name جيلان (Ceylan 
, جيلان 
, Gilan ) , in the world, is a widespread surname. The surname جيلان is characteristic of Turkey, where it is a common surname, Yemen, where it is quite a rare surname, and Ireland. Measured by absolute frequency, it is commonest in Turkey, the United Kingdom, and Germany. Much less frequently, جيلان is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ceylan | Australia, Germany, Turkey, United Kingdom, United States |
| جيلان | Yemen, Egypt, Syria, Iraq, Saudi Arabia |
| Gilan | Germany, Egypt, Turkey, United Kingdom, United States |
| Gillan | Pakistan, Germany, Egypt, United Kingdom, United States |
| علي حسن أحمد جيلان Yemeni politician, YE (b. 1963) |
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| خالد عبد الباري جيلان Yemeni politician, YE (b. 1973) |
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