Surname Celsius (Celsius 
, Celsus 
) , around the globe, is a rare cognomen. The family name Celsius is characteristic of Sweden, where it is a rare surname, Nigeria, and Myanmar, where it is a very rare surname. In absolute terms, it is commonest in Nigeria, Indonesia, and Sweden. Also, Celsius is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Celsius | Tanzania, Indonesia, Nigeria, Sweden, Democratic Republic of the Congo |
| Celsus | Philippines, Brazil, United States, Nigeria, Indonesia |
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magnus nicolai celsius Swedish astronomer (1621-1679), SE (b. 1621) |
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olof celsius Swedish botanist (1670-1756), SE (b. 1670) |
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anders celsius Swedish astronomer, physicist, and naturalist (1701-1744), SE (b. 1701) |
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| nils celsius Swedish astronomer, SE (b. 1658) |
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| johan celsius Swedish actor, SE (b. 1660) |
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olof celsius den yngre Swedish priest and historian (1716-1794), SE (b. 1716) |
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| barbro celsius 1670, SE (b. 1670) |
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| nils celsius (b. 1739) |
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celsius waterberg SR (b. 1960) |
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| celsius akwan choir director and composer, ID |
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| ryan celsius American music curator and YouTuber |
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