Surname Karthu (Karthu 
) , in the entire world, is a rare last name. The last name Karthu is habitual in Kuwait, where it is a rare surname, Saudi Arabia, where it is a very rare surname, and India. Much more prevalently, Karthu is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Karthu | Saudi Arabia, Kuwait, India |