Surname Ciach (Ciach 
) , around the globe, is quite a rare cognomen. The last name Ciach is habitual in Poland, where it is quite a rare surname, Norway, where it is a very rare surname, and Canada. In absolute terms, it is commonest in Poland, the United States, and Italy. More frequently, Ciach is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Ciach | Poland, Canada, Italy, Germany, United States |
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maria ciach Polish javelin thrower, PL (b. 1933) |
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tomasz ciach researcher ORCID ID = 0000-0002-8726-8944, PL (b. 1965) |
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| alina ciach Polish researcher (Institute of Physical Chemistry), PL (b. 1955) |
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| michał aleksander ciach researcher |
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| jan leszek ciach Polish mathematician |
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| michał ciach researcher, PL |
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| daniel ciach Polish footballer, PL (b. 1990) |
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