Family name كايس (Kais 
, Kayes , Cayce 
) , in the entire world, is a common surname. The surname كايس is characteristic of Tunisia, where it is quite a common surname, Estonia, and Lebanon. Not in comparison with a country's population, it is the most numerous in Bangladesh, Tunisia, and Algeria. Likewise, كايس is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kais, Kayes | Tunisia, Algeria, United States, India, Bangladesh |
| Cayce | Australia, United States, India, Canada, Democratic Republic of the Congo |
| كايس | Sudan |