Across the world, Þórarinn (Þórarinn 
, Thorarinn 
) is a very rare boy's first name. The forename Þórarinn is habitual in Northern Europe, particularly Iceland, where it is quite a common male name. Much less frequently, Þórarinn is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Þórarinn | Iceland |
| Thorarinn | Spain, Norway, United States, Iceland |
| þórarinn ragabróðir óleifsson (b. 920) |
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| þórarinn loftunga Icelandic poet, IS (b. 980) |
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| þórarinn þórólfsson (b. 973) |
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| þórarinn böðvarsson Icelandic politician (1825-1895), IS (b. 1825) |
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þórarinn kr. eldjárn (b. 1886) |
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| þórarinn b. þorláksson Icelandic painter (1867-1924), IS (b. 1867) |
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| þórarinn tulinius (b. 1860) |
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þórarinn eldjárn Icelandic writer, IS (b. 1949) |
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| þórarinn guðmundsson (b. 1896) |
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| þórarinn ólafsson (b. 1937) |
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| þórarinn tyrfingsson (b. 1947) |
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| þórarinn ingi pétursson Icelandic politician (b. 1972) |
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| þórarinn kristjánsson Icelandic footballer, IS (b. 1980) |
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| þórarinn ingi valdimarsson Icelandic footballer, IS (b. 1990) |
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| þórarinn stuttfeldr |
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Ólason, Jóhannsson, Thorarensen, Einarsson, Ólafsson, Þórisson, Sigurðsson, Sigurbergsson, Stefánsson, Andrésson, Halldórsson, Hjartarson, Valgeirsson, Friðriksson, Friðjónsson, Sigurgeirsson, Gunnarsson, Þórarinsson, Guðnason, Þorbjörnsson, Bjarnason, Sveinsson, Þór, Björn, Eldjárn, Óðinsson, Möller, Snorrason, Arnarson, Pálsson, Jónsson, Harðarson, Helgason, Hjálmarsson, Ivarsson, Árnason, Þórsson, Magnússon, Sverrisson, Benedikz, and Kristjánsson