Other Forms FormsFersith
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Contributor Contrib.LMS on 3/19/2009
Anglicized form of the Gaelic personal name Fearsithe, composed of the elements fear ‘man’ + sith ‘peace’. Some early forms with prepositions, as for example William de Fersith (Edinburgh 1365), seem to point to an alternative origin as a habitational name, but no place name of suitable form is known. The spelling Forsythe is associated chiefly with northern Ireland.