Shannon Family History
Shannon Surname Meaning
Irish:: shortened form of Shanahan. Shortened Anglicized form of Gaelic Ó Seanáin ‘descendant of Seanán’ a personal name based on a pet form of seán ‘old’. This Irish surname became established in Scotland in the 14th century.
In County Clare, a shortened Anglicized form of Mac Giolla tSeanáin ‘son of the servant of St. Seanán’.
In the Irish midlands, Leonard and Nugent have been adopted as equivalents of this name.
Source: Dictionary of American Family Names 2nd edition, 2022