Surname Громанн (Gromann 
, Громанн 
) , all around the world, is quite a rare family name. The surname Громанн is characteristic of Slovakia, where it is quite a rare surname, Germany, where it is a rare surname, and Switzerland. Measured by absolute frequency, it is commonest in Germany, Brazil, and Afghanistan.
| VARIANT | COUNTRY |
|---|---|
| Gromann | Germany, Slovakia, Switzerland, Afghanistan, Brazil |
| Громанн | Belarus, Russia, Ukraine |