McGann is an Irish surname, derived from the Gaelic MagAnnaidh, an Old Irish translation or sept of the Mac Cana clan.
The Cana particle is a personal name meaning 'cub/whelp', although some sources claim it is derived from the personal name Annadh.
Due to anglicization and Ulster migration the original form Mac Cana has had many variations, such as MagAnnaidh, MacAnna and MacCanna, later anglicized to McGann and McCann.
The name became McGann upon Ulster migration to Connaught and became Canny and Canney upon Ulster migration to the south (Leinster and Munster).
The McGann acting family consists of four brothers: Macan, John David (1997) MacCana of Clanbrassil an ancestral and family history, Published by John Macan, Queensland.