Ó Troighthigh, is a Gaelic-Irish surname.
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The Ui Troighthigh (foot-soldier) were natives of Thomond who removed to Ormond. They became a hereditary medical family, operating in what is now County Clare, County Limerick and County Tipperary, as well as elsewhere in Munster, and Leinster.
The name is now anglicised as Troy. Members of the Anglo-Irish de Treo family (associated with Limerick city since 1189) and the Gaelic-Irish Ó Tréamháin family also use the form Troy, making members of all three unrelated families indistinguishable.