/ · 1894 Brewer’s · M · M
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i.e. Mac. A Gaelic prefix meaning son. (Gothic, magus, a son; Sanskrit, mah, to grow; Welsh, magu, to breed.) The Welsh ap is Mac changed to Map, and contracted into ’ap or ’p, as Apadam (’Ap Adam), Prichard (’P Richard).
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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.