Surname Turnball (Turnball 
) , in the entire world, is a rare family name. The cognomen Turnball is habitual in Australia, where it is a rare surname, the United Kingdom, and Canada, where it is a very rare surname. Not in comparison with a country's population, it is commonest in the United Kingdom, Australia, and the United States.
| VARIANT | COUNTRY |
|---|---|
| Turnball | Canada, United Kingdom, United States, Australia |