Family name Zerby (Zerby 
) , in all the world, is a rare last name. The surname Zerby is habitual in the United States, where it is a rare surname, New Zealand, where it is a very rare surname, and Italy. In absolute terms, it is commonest in the United States, Italy, and Germany.
| VARIANT | COUNTRY |
|---|---|
| Zerby | Canada, Italy, France, United States, Germany |
| karen zerby Cult leader, US (b. 1946) |
|