Cognomen Thordarson (Thordarson 
) , all over the world, is quite a rare surname. The surname Thordarson is habitual in Northern Europe, particularly Iceland, where it is a common surname, Denmark, where it is quite a rare surname, and Norway. Measured by absolute frequency, the name is most common in Iceland, Canada, and the United States.
| VARIANT | COUNTRY |
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| Thordarson | Norway, Canada, Iceland, United States, Denmark |
Þórdarson, Þórðarson, and Тхордарсон
| thorkell thordarson (b. 944) |
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fridrik thordarson Icelandic linguist (1928-2005), IS (b. 1928) |
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| tomas thordarson Danish singer (b. 1974) |
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| thorvaldur thordarson researcher |
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| helga thordarson researcher ORCID ID = 0000-0001-9042-8171 |
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| helga thordarson researcher (ORCID 0000-0001-6500-1651) |
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| petur heidar thordarson (b. 1972) |
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| william thordarson |
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| finnur dór thordarson |
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| sigurdur thordarson madeself harkkiri (b. 1992) |
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| katarina weiner thordarson Swedish writer, SE |
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