Cognomen Jónasson (Jónasson 
, יונסון 
, Йонассон 
) , across the world, is a rare last name. The last name Jónasson is habitual in Northern Europe, particularly Iceland, where it is quite a common surname, Denmark, where it is a rare surname, and Norway, where it is a very rare surname. In absolute terms, it is the most numerous in Iceland, Denmark, and Russia.
| VARIANT | COUNTRY |
|---|---|
| Jónasson | Iceland, Norway, United States, Denmark |
| יונסון | Israel |
| Йонассон | Ukraine, Russia |
|
hermann jónasson Icelandic politician, IS (b. 1858) |
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| sigurður jónasson (b. 1827) |
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hermann jónasson politician (1896-1976), IS (b. 1896) |
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| jónas jónasson (b. 1856) |
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| helgi jónasson Icelandic farmer, botanist (1887-1972), IS (b. 1887) |
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ögmundur jónasson politician, IS (b. 1948) |
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| haraldur jónasson (b. 1895) |
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| matthías jónasson (b. 1902) |
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| pétur m. jónasson Icelandic biologist (1920-2020), IS (b. 1920) |
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| jón örn jónasson Icelandic association football player (1923-1983), IS (b. 1923) |
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| jónas jónasson Icelandic musician, teacher, IS (b. 1931) |
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| reynir jónasson Icelandic musician, accordionist, IS (b. 1932) |
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| gestur einar jónasson Icelandic actor, IS (b. 1950) |
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| kári jónasson IS (b. 1940) |
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| ögmundur jónasson IS (b. 1948) |
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Ari, Birgir, Björn, Bjarni, Bjarki, Pétur, Ragnar, Reynir, Gunnar, Guðni, Guðjón, Jónas, Jóhann, Tómas, Hallur, Heimir, Hildur, Hörður, Viktor, Sigurfreyr, Stefán, Steinar, Baldur, Arnór, Sveinn, Sævar, Aron, Atli, Jón, Örn, Óli, Andri, Arnar, Bragi, Kári, Petur, Andreas, Gylfi, Einar, Egill, Helgi, Hlynur, Oddur, Ísak, Þorri, Þröstur, Markús, Magnús, Jakob, and Brynjar