Claasen

Claasen is a surname of Dutch origin, a variant of Claassen, historically used in the Netherlands. It is a patronymic surname derived from the given name Claas, a Dutch form of Claus or Nikolaus, with the suffix -en signifying “son of.” Thus Claasen originally meant “son of Claas.”

Variants and cognates include Claassen and Clausen; the double 'a' in Claasen reflects older Dutch orthography. The name is related to other patronymic forms formed from Claas/Claus across Dutch, German, and Scandinavian areas.

Distribution and usage: The surname is most common in the Netherlands and among descendants in North America, Australia, and parts of Europe resulting from migration and diaspora. It occurs in various spellings depending on region and historical records.

Related surnames and nomenclature: Claassen, Clausen, and other Claudia/Claus-based patronymics are linguistically connected through the root Claas/Claus, reflecting common naming practices in Dutch and broader Germanic-speaking regions.