Cognomen Þráinsson (Þráinsson 
) , all over the world, is a very rare family name. The surname Þráinsson is characteristic of Northern Europe, particularly Iceland, where it is quite a common surname.
| höskuldur þráinsson (b. 985) |
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þorgrímur þráinsson Icelandic footballer, IS (b. 1959) |
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| höskuldur þráinsson Icelandic professor of Modern Icelandic, IS (b. 1946) |
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| karl þráinsson Icelandic handball player, IS (b. 1965) |
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