Cognomen Diem (Diem 
, Дим 
, ديم 
) , in the entire world, is a common surname. The family name Diem is habitual in Switzerland, where it is quite a common surname, Austria, and Vietnam, where it is quite a rare surname. Not in comparison with a country's population, the name is most common in Vietnam, Germany, and the United States. Likewise, Diem is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Diem | Austria, Germany, Vietnam, United States, India |
| Дим | Kazakhstan, Russia, Ukraine, Kyrgyzstan |
| ديم | Iran, Iraq, Egypt, Sudan, Saudi Arabia |
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carl diem German sports administrator (1882-1962), DE (b. 1882) |
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| josef diem (b. 1836) |
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| august diem (1848-1895), CH (b. 1848) |
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| carl diem Austrian balneologist and physician (1866-1936) (b. 1866) |
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| otto diem (1875-1950), CH (b. 1875) |
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| ulrich diem CH (b. 1871) |
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| ludwig diem German physician (1882-1978), DE (b. 1882) |
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emmo diem Austrian musician, AT (b. 1934) |
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| julius diem Austrian politician (1886-1952), AT (b. 1886) |
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peter diem Austrian author, AT (b. 1937) |
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| josé diem botanist (1899-1986) (b. 1899) |
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| josef diem Austrian politician (1900-1962), AT (b. 1900) |
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| hermann diem German theologian (1900-1975), DE (b. 1900) |
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| nelly diem (b. 1891) |
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| armin diem Austrian author, AT (b. 1903) |
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