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In page Surnames by country:

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Before the 19th century there was the same system in Scandinavia as in Iceland today. Noble families, however, as a rule adopted a family name, which could refer to a presumed or real forefather or to the family's coat of arms. In many surviving family noble names, such as Silfversparre ("silver chevron"; in modern spelling, Silver-) or Stiernhielm ("star-helmet"; in modernized spelling, stjärnhjälm), the spelling is obsolete, but since it applies to a name, remains unchanged. (Some names from relatively modern times also use archaic or otherwise aberrant spelling as a stylistic trait; e.g. -quist instead of standard -kvist "twig" or -grén instead of standard -gren, "branch".)[citation needed]