Cognomen Krais (Christ 
, Krais 
, Крайс 
) , worldwide, is a common last name. The family name Krais is habitual in Germany, where it is quite a common surname, Switzerland, and Gabon, where it is quite a rare surname. Measured by absolute frequency, the name is most common in Germany, the United States, and Indonesia. More frequently, Krais is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Christ | Germany, Cameroon, United States, Democratic Republic of the Congo, Ivory Coast |
| Krais | Germany, France, Brazil, Poland, United States |
| Крайс | Ukraine, Kazakhstan, Belarus, Russia, Kyrgyzstan |
| johann christoph krais (b. 1732) |
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| philipp friedrich krais DE (b. 1765) |
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| julius krais German author and theologian, DE (b. 1807) |
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| emilie klara krais DE (b. 1805) |
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| friedrich aaron krais (1821-1907), DE (b. 1821) |
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| wilhelm heinrich krais DE (b. 1815) |
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| bertha krais (b. 1833) |
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| herman krais (b. 1837) |
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| theodora krais (b. 1838) |
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| elisabeth krais (1851-1907) (b. 1851) |
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| mathilde krais (b. 1842) |
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| clara krais (b. 1843) |
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| paul friedrich julius krais (b. 1848) |
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| felix krais (b. 1853) |
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| paul krais DE (b. 1866) |
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Mr, Jair, Jake, Jose, John, Joan, Jill, Nils, Neri, Elsi, Maria, Mario, Mauro, Susan, Alceu, Andre, Angel, Araci, Agata, Carol, Clari, Cleci, Luis, Lisa, Lena, Gert, Ms, Ana, Din, Joe, Tim, Fam, Ivo, Mart, Mark, Shay, Brian, Shuk, Anna, Asko, Cary, Kaic, Paul, Ralf, Ruth, Dari, Davi, Dawn, Alex, and Bruna