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Mac-

1.
a prefix found in many family names of Irish or Scottish Gaelic origin, as MacBride and Macdonald.
Also, Mc-, Mc-, M'-.
Origin
< Irish, Scots Gaelic mac son, Old Irish macc; akin to Welsh, Cornish mab
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for Mac-

Mac-

prefix
1.
(in surnames of Scottish or Irish Gaelic origin) son of: MacDonald, MacNeice
Word Origin
from Goidelic mac son of; compare Welsh mab, Cornish mab
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for Mac-

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
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Word Value for Mac

7
9
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