Surname Jonáš (Jonáš 
, Йонаш 
) , across the world, is quite a rare family name. The cognomen Jonáš is characteristic of Eastern Europe, particularly Czechia, where it is quite a rare surname, Ukraine, and Slovakia. Likewise, Jonáš is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Jonáš | United States, Czechia, Slovakia |
| Йонаш | Ukraine, Belarus, Russia |
| jozef jonáš (1787-1821), HU (b. 1787) |
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karel jonáš Czech politician and publicist, CZ (b. 1865) |
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vratislav jonáš CZ (b. 1899) |
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| otakar jonáš CZ (b. 1862) |
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martin jonáš RS (b. 1924) |
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| josef jonáš Czechoslovak politician (1888-1960), CZ (b. 1888) |
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josef jonáš Czech doctor, CZ (b. 1945) |
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| františek jonáš (b. 1887) |
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| františek jonáš CZ (b. 1890) |
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| jaroslav jonáš CZ (b. 1892) |
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| albert jonáš CZ (b. 1893) |
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vítězslav jonáš Czech senator of Czech Parliament and local politician, CZ (b. 1955) |
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| václav jonáš CZ (b. 1899) |
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| ladislav jonáš CZ (b. 1902) |
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| josef jonáš Czechoslovak member of Czechoslovak national parliament, minister of light industry, minister of fuel and energetics, minister of construction and Czechoslovak politician, CZ (b. 1913) |
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