Family name Кости (Costi 
, Kosti 
, Costey 
) , in the world, is a common cognomen. The surname Кости is habitual in Cyprus, where it is quite a common surname, Greece, where it is quite a rare surname, and Italy. Measured by absolute frequency, it is commonest in Italy, India, and Romania. Also, Кости is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Costi | France, Romania, Italy, Cyprus, Brazil |
| Kosti | Sudan, Brazil, Greece, Cyprus, India |
| Costey | Spain, France, Canada, United States, Brazil |
| Кости | Ukraine, Russia, Armenia |
Konsta, Konstantin, Kosty, Канстанцін, Константин, Костянтин, and كونستانتين