Worldwide, Halldór (Halldór 
, Halldor 
) is a rare male first name. The forename Halldór is characteristic of Iceland, where it is quite a common boy's name, Germany, where it is a very rare masculine name, and the United States, where it is an extremely rare male name. Very seldom, Halldór is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Halldór | United Kingdom, Norway, United States, Denmark, Iceland |
| Halldor | Norway, United States, Denmark, Iceland, Germany |
| halldór héðinsson IS (b. 920) |
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| halldór snorrason (b. 1010) |
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| halldór jónsson hertekni (b. 1586) |
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| halldór brynjólfsson (b. 1692) |
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| halldór jakobsson (b. 1735) |
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halldór kiljan laxness Icelandic author (1902-1998), IS (b. 1902) |
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| halldór jónsson (b. 1857) |
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| halldór hermannsson IS (b. 1878) |
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| halldór stefánsson Icelandic writer and playwright, IS (b. 1892) |
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halldór ásgrímsson Icelandic politician (1947-2015), IS (b. 1947) |
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| halldór pjetursson (b. 1897) |
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| halldór halldórsson Icelandic linguist, IS (b. 1911) |
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| halldór h. jónsson Icelandic architect, IS (b. 1912) |
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| halldór e. sigurðsson Icelandic politician, IS (b. 1915) |
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| halldór pétursson Icelandic painter, illustrator, graphic designer, IS (b. 1916) |
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Kvaran, Einarsson, Eiríksson, Ingólfsson, Óskarsson, Ólafsson, Þorsteinsson, Þorkelsson, Sigurðsson, Stefánsson, Kjartansson, Pétursson, Guðmundsson, Jóhannesson, Halldórsson, Hermannsson, Hilmarsson, Kristinsson, Ragnarsson, Gunnarsson, Gunnlaugsson, Haraldsson, Erlendsson, Jóhannsson, Jónasson, Gíslason, Geirsson, Lárusson, Arnarson, Pálsson, Jónsson, Harðarson, Hauksson, Ingvason, Árnason, Ómarsson, Kristjánsson, Magnússon, Sveinsson, Svavarsson, Arnarsson, Axelsson, Baldursson, Bachmann, Björnsson, Bjarnason, Karlsson, Guðjónsson, Sverrisson, and Vilhjálmsson