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Geoghegan (Irish: Mag Eochagáin) is a surname of Irish origin.
Often spelled without the prefix "Mac", the name has many variants, including Gehegan, Geoghan, Geohegan, Gahagan, Gagan, and Gagon which approximate the most common pronunciations of the name. It is usually pronounced /ˈɡeɪɡən/ GAY-gən, /ˈɡɛhəɡən/ GEH-hə-gən or /ˈɡoʊhɪɡən/ GOH-hig-ən. In Irish it is Mag Eochagáin, from "Eochaidh," a popular medieval Irish and Scottish Gaelic name deriving from Old Irish ech, meaning "horse." The initial "G" of Geoghegan comes from the prefix Mag, a variant of Mac and the anglicised form Mageoghegan or McGeoghegan was formerly much used.