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
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
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).