Surname Кръстю (Кръстю 
, Krastyo 
, Krstiu ) , in all the world, is quite a common cognomen. The surname Кръстю is characteristic of Eastern Europe, particularly Bulgaria, where it is quite a common surname. Also, Кръстю is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Кръстю | Bulgaria, Kazakhstan, Russia |
| Krastyo | Spain, Bulgaria, United Kingdom, United States, Greece |
| Krstiu | United States |