Cognomen Margeirsson (Margeirsson 
) , all around the world, is a rare last name. The family name Margeirsson is habitual in Iceland, where it is quite a common surname, Norway, where it is a very rare surname, and Canada, where it is an extremely rare surname. Much less frequently, Margeirsson is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Margeirsson | Norway, Canada, Spain, Iceland, United Kingdom |
| ingólfur margeirsson writer, IS (b. 1948) |
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| ragnar margeirsson Footballer (1962-2002), IS (b. 1962) |
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| veigar margeirsson Icelandic composer, IS (b. 1972) |
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| bjorn margeirsson researcher |
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| helgi margeirsson college basketball player (2004–2005) Birmingham-Southern |
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| sveinn margeirsson researcher |
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| bjarni biering margeirsson Working at the Blender Animation Studio |
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| finnur orri margeirsson Icelandic association football player, IS (b. 1991) |
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