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Type Surname (from nickname)
Anglicized form of Gaelic Ó Taithligh "descendant of Taithleach", a byname meaning "quiet", "peaceable".
Anglicized form of Gaelic Ó Maol Tuile "descendant of the devotee of the will of God" (from toil "will of God").
Type Surname (from location)
Habitational name from any of various places called Tullo in eastern Scotland.