Cognomen Karetu (Karetu 
) , globally, is an extremely rare family name. The surname Karetu is characteristic of New Zealand, where it is a very rare surname, and India, where it is an extremely rare surname. Also, Karetu is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Karetu | New Zealand, India |
|
timoti karetu Māori scholar, NZ (b. 1937) |
|