Cognomen Ranum (Ranum 
, Ранум 
) , all over the world, is quite a rare last name. The family name Ranum is characteristic of Norway, where it is quite a rare surname, Denmark, and Malaysia, where it is a rare surname. In absolute terms, it is the most numerous in the United States, Norway, and Indonesia. Much less frequently, Ranum is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Ranum | Denmark, Norway, United States, Indonesia, Malaysia |
| Ранум | Kazakhstan |
| arthur ranum (b. 1870) |
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| ingeborg helene ranum Norwegian photographer and politician, NO (b. 1910) |
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marcus j. ranum researcher, US (b. 1962) |
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| olaf t. ranum Norwegian musician (1914-2004) (b. 1914) |
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| edith ranum Norwegian writer (1922–2002), NO (b. 1922) |
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| orest ranum American historian, US (b. 1933) |
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| thorleif ranum SE (b. 1924) |
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| jane ranum American politician, US (b. 1947) |
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| ranum ak. mina politician (b. 1951) |
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| jesper ranum DK (b. 1959) |
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| laura ranum neurogenetics researcher (ORCID 0000-0001-9808-9661) |
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| arthur ranum Ph.D. The University of Chicago 1906 |
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| nancy ranum researcher |
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| henriette ranum |
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| torkil ranum |
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