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Scottish northern English and Jewish (Ashkenazic): from the personal name David + -son. As a Jewish name the last element comes from German Sohn ‘son’. Irish (Down) and Scottish: adopted for Gaelic Mac Daibhéid ‘son of David’; see McDevitt . Americanized form (and a rare Swedish variant) of Swedish Davidsson: patronymic from the personal name David . Americanized form of Norwegian Danish and North German Davidsen a cognate of 3 above.
Source: Dictionary of American Family Names 2nd edition, 2022