Mortenson
A patronymic surname meaning “son of Morton,” ultimately tied to a place name or personal name derived from the sea or marshland.
The #7,710 most common surname in the United States (2010 Census) — about 1 in every 71,701 Americans shares it.
Etymology
Mortenson is a patronymic surname built with the English and Scandinavian-style suffix -son, meaning “son of.” It most likely means “son of Morton,” with Morton itself usually derived from Old English elements meaning “moor” or “marsh” plus “settlement” or “farm,” though in some cases it can come from a personal name. The surname therefore points either to descent from a man named Morton or, more indirectly, to an ancestral place called Morton.
History
The name is found especially in English-speaking countries and is common in families of British or Scandinavian-American background. In the United States, Mortenson often reflects immigrant naming patterns in which older Scandinavian forms were adapted to English spelling. Related surnames such as Mortensen, Mortinson, and Morrison can overlap in history and geography, so individual family lines may have more than one possible root.
Origin
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Fun fact
Because Mortenson is patronymic, two unrelated families can share the surname even if their “Morton” ancestor was centuries apart.