Introduction The surname “Keegan” has deep roots in Irish heritage, representing a lineage that traces back to the clan name Mac Aodhagáin. The name itself is an Anglicisation of this Gaelic origin, which signifies “son” or “descendant of Aodhagán.” The term Aodhagán is a diminutive form of the Irish name Aodh, meaning “fire” or “fiery,”…