Surname Jaša (Яша 
, Jaša 
) , all around the world, is a rare cognomen. The surname Jaša is habitual in Czechia, where it is quite a rare surname, Croatia, where it is a rare surname, and Kyrgyzstan. Measured by absolute frequency, the name is most common in Russia, Czechia, and Kyrgyzstan. More frequently, Jaša is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Яша | Ukraine, Kazakhstan, Belarus, Russia, Kyrgyzstan |
| Jaša | Czechia, Slovenia, Croatia |
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václav jaša Czechoslovak member of Czechoslovak national parliament, legioneer and Czechoslovak politician, CZ (b. 1886) |
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| jan jaša (b. 1890) |
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| alois jaša CZ (b. 1907) |
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| ladislav jaša (b. 1914) |
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| vlastimil jaša CZ (b. 1924) |
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| bohumil jaša CZ (b. 1925) |
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| jaroslav jaša (b. 1941) |
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| ladislav jaša (b. 1945) |
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| luděk jaša CZ (b. 1957) |
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| františek jaša (b. 1961) |
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| karel jaša CZ |
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