Frequency: (109)
(number of times this surname appears in a sample database of 88.7 million names, representing one third of the 1997 US population)
Of Irish origin: Woulf found McCoghegan in Cavan, later McCogan, Cogan, from Gaelic Mac Eochagáin, a patronymic from a diminutive of Eochaidh meaning ‘horseman’ (a derivative of each ‘horse’).
See the Key to the Dictionary or consult the General Introduction for further explanation.
