Cognomen Soja (Зоя 
, Soja 
, 索雅 
) , across the world, is a common last name. The surname Soja is characteristic of Kyrgyzstan, where it is quite a common surname, Armenia, and Bulgaria, where it is quite a rare surname. Not in comparison with a country's population, the name is most common in India, Kyrgyzstan, and Nigeria. Much more frequently, Soja is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Зоя | Kazakhstan, Russia, Kyrgyzstan, Belarus, Ukraine |
| Soja | Ghana, India, Nigeria, United States, Poland |
| 索雅 | China |
| Соя | Kazakhstan, Armenia, Russia, Kyrgyzstan, Ukraine |
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soja dmitrijewna bucharowa NL (b. 1876) |
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edward soja American urban planner, US (b. 1940) |
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| else soja Austrian writer, AT (b. 1900) |
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| zbigniew soja (b. 1904) |
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| omar m. gil soja Uruguayan writer, UY (b. 1920) |
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| edmund soja PL (b. 1921) |
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| józef soja Officer of the Polish Army, PL (b. 1937) |
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| jan soja PL (b. 1931) |
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| jean andré soja Malagasy politician, MG (b. 1946) |
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| rolf soja German songwriter, arranger, record producer, DE (b. 1947) |
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| soja joseph bewarang (b. 1948) |
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| anna-maria soja Austrian librarian, AT (b. 1959) |
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| gerhard soja Austrian agronomist, AT (b. 1959) |
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| amber soja researcher |
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| natalia soja-kukieła Polish mathematician |
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