McManus is an Irish surname that originated from the Gaelic “Mac Maghnuis,” meaning “son of Manus.” Manus was a common name in Ireland and is associated with the ancient legendary figure of Manannán mac Lir, the god of the sea. The McManus family was prominent in County Fermanagh, where they were known for their involvement in the linen trade. Today, McManus can be found all over the world, with notable figures including Irish playwright Brian Friel and American football coach John McManus.
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