Cognomen Croth (Croth 
) , all over the world, is a very rare last name. The cognomen Croth is habitual in Canada, where it is a very rare surname, New Zealand, and Brazil, where it is an extremely rare surname. Measured by absolute frequency, it is commonest in Canada, Brazil, and the United States. Much less frequently, Croth is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Croth | Brazil, Canada, New Zealand, United States |