Cognomen Gierlichs (Gierlichs 
) , throughout the world, is a rare last name. The family name Gierlichs is habitual in Germany, where it is a rare surname, the United Kingdom, where it is an extremely rare surname, and Mexico. Not in comparison with a country's population, it is the most numerous in Germany, Mexico, and the United States.
| VARIANT | COUNTRY |
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| Gierlichs | Germany, United Kingdom, Mexico, United States, Brazil |
| karl gierlichs DE (b. 1819) |
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| willy gierlichs German university teacher (1900-1945), DE (b. 1900) |
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| alban gierlichs (b. 1899) |
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| hanns gierlichs (b. 1907) |
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| karl-josef gierlichs (b. 1930) |
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| joachim gierlichs (b. 1959) |
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| benedikt wolf gierlichs Ph.D. Katholieke Universiteit Leuven 2011 |
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