Geraghty (/ˈɡɛrəti/) and the variant Garaghty are Irish surnames, it was originally written in a Gaelic form as Mag Oireachtaigh (or MacGeraghty in English), the name is derived from the word "oireachtach," referring to a member of an assembly. The name of the modern national legislative body in Ireland, the Oireachtas comes from the same Gaelic root.