Cognomen Кирстен (Kirsten 
, Kierstin 
, Kirstena 
) , worldwide, is a common last name. The cognomen Кирстен is habitual in Namibia, where it is quite a common surname, Germany, where it is quite a rare surname, and South Africa. Not in comparison with a country's population, it is commonest in Germany, South Africa, and Brazil. More frequently, Кирстен is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kirsten | Australia, United Kingdom, United States, Denmark, Germany |
| Kierstin | Spain, Australia, United Kingdom, Canada, United States |
| Kirstena | Egypt, United States |
| Кирстен | Russia |