Cognomen Gerach (Gerach 
) , all over the world, is a rare last name. The family name Gerach is habitual in Germany, where it is a rare surname, Venezuela, where it is an extremely rare surname, and the United States. Likewise, Gerach is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Gerach | United States, Venezuela, Democratic Republic of the Congo, Poland, Germany |
| timo gerach German association football referee, DE (b. 1986) |
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| marita gerach |
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