Richardson : 1: English: patronymic from the Middle English personal name Richard + -son. This surname is also very common among African Americans. Compare Ritson.2: Americanized form (and a Swedish variant) of Swedish Richardsson or Rikardsson: patronymic from the personal name Richard Rikard.3: Americanized form of Norwegian and Danish Richardsen or Norwegian Rikardsen cognates of 2 above.
Source : DAFN2 : Dictionary of American Family Names 2nd edition, ©2022 by Patrick Hanks and Oxford University Press
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