Family name Гайделис (Гайделис 
, Gaidelis 
) , all over the world, is a rare cognomen. The surname Гайделис is characteristic of Lithuania, where it is quite a rare surname, Latvia, and Hungary, where it is a rare surname. Not in comparison with a country's population, it is commonest in Lithuania, Latvia, and the United States.
| VARIANT | COUNTRY |
|---|---|
| Гайделис | Russia, Ukraine |
| Gaidelis | United Kingdom, Hungary, United States, Latvia, Lithuania |