Cognomen Guenthoer (Guenthoer 
) , in the world, is a rare surname. The surname Guenthoer is habitual in Austria, where it is a rare surname, Germany, where it is a very rare surname, and Thailand, where it is an extremely rare surname. Measured by absolute frequency, it is commonest in Germany, Austria, and the United States.
| VARIANT | COUNTRY |
|---|---|
| Guenthoer | Germany, China, Austria, Thailand, United States |