Cognomen Gierach (Gierach 
) , in the world, is a rare last name. The last name Gierach is habitual in Poland, where it is a rare surname, the United States, and Germany, where it is a very rare surname. Also, Gierach is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Gierach | Germany, United Kingdom, United States, Poland, Canada |
| erich gierach German politician (1881-1943), PL (b. 1881) |
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gretchen gierach American epidemiologist |
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| john gierach American sportswriter, US (b. 1946) |
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| michelle gierach researcher (ORCID 0000-0002-4411-518X) |
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| gretchen l gierach researcher (ORCID 0000-0002-0165-5522) |
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| michelle gierach researcher, ORCID id # 0000-0002-8161-4121 |
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| bertha gierach |
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