Family name Speltz (Speltz 
) , in all the world, is a rare cognomen. The last name Speltz is habitual in Luxembourg, where it is quite a rare surname, the United States, where it is a rare surname, and Brazil, where it is a very rare surname.
| VARIANT | COUNTRY |
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| Speltz | Brazil, Germany, France, United States, Luxembourg |
| johannes august speltz DE (b. 1823) |
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| george henry speltz Catholic bishop (1912-2004), US (b. 1912) |
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| david speltz German American musician, DE (b. 1955) |
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| thomas speltz researcher |
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| jeff speltz nuclear physicist at SUBATECH, France |
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| alexander speltz Cartographer and engineer |
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| peter speltz researcher |
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| alexander speltz |
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| ben speltz Luxembourgian badminton player, LU (b. 1990) |
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