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 |
|---|---|
| Яша | Kyrgyzstan, Russia, Kazakhstan, Ukraine, Belarus |
| Jaša | Croatia, Czechia, Slovenia |
|
václav jaša Czechoslovak member of Czechoslovak national parliament, legioneer and Czechoslovak politician, CZ (b. 1886) |
|
| jan jaša (b. 1890) |
|
|
| alois jaša CZ (b. 1907) |
|
|
| ladislav jaša (b. 1914) |
|
|
| vlastimil jaša CZ (b. 1924) |
|
|
| bohumil jaša CZ (b. 1925) |
|
|
| jaroslav jaša (b. 1941) |
|
|
| ladislav jaša (b. 1945) |
|
|
| luděk jaša CZ (b. 1957) |
|
|
| františek jaša (b. 1961) |
|
|
| karel jaša CZ |
|