WORD ORIGIN a combining form, used especially to form nonce words, with the meaning “generic; homogenized”: McSchools that offer no individual attention; reading McNews instead of a serious newspaper. Origin of Mc- 1
Mc(Donald's), chain of fast-food restaurants a prefix found in many family names of Irish or Scottish Gaelic origin, as MacBride and Macdonald.
Mc- M c-, 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 mc- usage
For names beginning with this prefix, see under
Mac- prefix (in surnames of Scottish or Irish Gaelic origin) son of MacDonald; MacNeice Word Origin for Mac-
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 mc-
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