mac or mc means son of as in Risteard MacFheorais. Richard son of Pierce. similiarly O' means grandson. Risteard O' Dympsaig. Richard grandson of Dempsey
In Irish names "Mac" means "Son" and "Ó" means "Grandson"
It is estimated that about 20% of Irish surnames have a Mac prefix. Mac means son; so Mac Carthaigh would mean 'son of Carthach'.
"Mac' is the Irish word for 'son'; Mac Carthaigh (son of Carthach, MacCarthy).
The Scottish Macs is the name of the book that can help you
Mc and Mac in surnames mean "son of".
Mac means son of so MacDonald is son of Donald.
Last names beginning with "Mc" or "Mac" are of Irish origins.
Mc is just a shorter way to spell Mac, Both countries will have their share of anglicised names beginning with Mc or Mac Mac = son
'Son' in Irish is 'mac'.Irish for son is, "mac.""Tá mac agus iníon agam" = "I have a son and a daughter."
The Irish Gaelic name Mac Óda is derived from their ancestor Odo Archdeacon.
It is my understanding that names that begin with "Mac" (or "Mc" for short, meaning "son of") are Irish.
Son of Rory (Mac Ruairí in Irish).