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.
Distribution and usage: The surname is most common in the Netherlands and among descendants in North America,
Related surnames and nomenclature: Claassen, Clausen, and other Claudia/Claus-based patronymics are linguistically connected through the root