Surname Каетан (Kajetan 
, Cajetan 
, Kaetan 
) , worldwide, is quite a common cognomen. The surname Каетан is habitual in Poland, where it is quite a rare surname, Nigeria, and Cameroon, where it is a rare surname. Likewise, Каетан is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kajetan | Poland, India, Nigeria, Germany, Austria |
| Cajetan | India, Cameroon, Nigeria, Germany, Austria |
| Kaetan | Tanzania, India, United Kingdom, Canada, United States |
| Каетан | Kazakhstan, Ukraine |