Last name Haraldsson (Haraldsson 
, Харальдссон) , in all the world, is quite a rare cognomen. The surname Haraldsson is characteristic of Iceland, where it is a common surname, Sweden, where it is quite a common surname, and Eswatini, where it is quite a rare surname. Not in comparison with a country's population, it is the most numerous in Northern Europe, particularly Sweden, Iceland, and Denmark.
| VARIANT | COUNTRY |
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| Haraldsson | Iceland, Eswatini, Denmark, Sweden, Angola |
Araldsen, Haraldsen, Haraldson, and Харалдссон
| trond haraldsson (b. 712) |
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| godfrid haraldsson Son of Danish king (b. 820) |
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| rodulf haraldsson Viking leader (b. 850) |
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| halfdan hvite haraldsson (878-915), NO (b. 878) |
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| rørek haraldsson Peerage person ID=42729 (b. 887) |
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| sigtrygg haraldsson Peerage person ID=42730 (b. 889) |
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| frode haraldsson (891-938), IE (b. 891) |
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| gyrd haraldsson (b. 882) |
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| torgils haraldsson Peerage person ID=42732, IE (b. 893) |
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| ulfljotr haraldsson (b. 918) |
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olof haraldsson Anti-king who ruled Scania, SE (b. 1150) |
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| erlend haraldsson Earl of Orkney, GB (b. 1124) |
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| magnus haraldsson King of Norway from 1142 until his death around 1145 (b. 1135) |
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| david haraldsson Earl of Orkney (b. 1160) |
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| jon haraldsson Earl of Orkney (b. 1180) |
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