Seamus is an equally unusual last name for all people. (2000 U.S. Census). Charted below is the baby name popularity of Seamus for boys. Seamus entered the list in 1995 and reached its apex rank of #735 in the U.S. in the year 2003, and is at #900 currently.eamus /sea-mus/ [2 sylls.] as a boys' name is pronounced SHAY-mus. It is of Irish and Hebrew origin, and the meaning of Seamus is he who supplants. Variant of James.  Shamus  is sometimes used as an American slang for a private detective.
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