Glennon Family History
Glennon Surname Meaning
Irish: shortened Anglicized form of Gaelic Mag Leannáin ‘son of Leannán’ a byname from leann ‘cloak’.
Scottish: shortened Anglicized form of Gaelic Mac Gille Fhinnein see McLennan.
Source: Dictionary of American Family Names 2nd edition, 2022
