a prefix found in many family names of Irish or Scottish Gaelic origin, as MacBride and Macdonald.
Also Mc- Mc-, M'-.
Origin of Mac-
< Irish, Scots Gaelic mac son, Old Irish macc; akin to Welsh, Cornish mab
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for m'-
(in surnames of Scottish or Irish Gaelic origin) son ofMacDonald; MacNeice
Word Origin for Mac-
from Goidelic mac son of; compare Welsh mab, Cornish mab
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Word Origin and History for m'-
common element in Scottish and Irish names, from Old Celtic *makko-s "son." Cognate root *makwos "son" produced Old Welsh map, Welsh mab, ap "son;" also probably cognate with Old English mago "son, attendant, servant," Old Norse mögr "son," Gothic magus "boy, servant," Old English mægð "maid" (see maiden).
Online Etymology Dictionary, © 2010 Douglas Harper