Family name origins & meanings
- Northern Irish : Anglicized form of Mac Shíomóin ‘son of Simon’; i.e. a Gaelicized variant of Fitzsimmons.
- Northern Irish : alternatively, perhaps an Anglicized form of Gaelic Mac Eamoinn ‘son of Eamonn’, a patronymic from the Gaelic form of the English personal name Edmond.