Last name Jacak (Jacak 
) , around the world, is a rare surname. The cognomen Jacak is habitual in Slovakia, where it is quite a rare surname, Poland, and Germany, where it is a very rare surname. Measured by absolute frequency, this name is the most popular in Poland, Slovakia, and India. More frequently, Jacak is the forename as well as the last name.
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barbara jacak Nuclear physicist, US |
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| lucjan jacak Polish physicist, PL (b. 1952) |
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| witold jacak researcher |
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| ronald jacak researcher |
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| lucjan jacak researcher |
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| jaroslaw jacak researcher ORCID ID = 0000-0002-4989-1276 |
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| janusz edward jacak researcher |
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