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First name origin & meaning:

Scottish: Son of righteousness

First name variations: Mccaulay, Macauley

Last name origins & meanings:

1. Scottish (Dumbartonshire) and Irish (Westmeath): Anglicized form of Gaelic Mac Amhalghaidh ‘son of Amhalghadh’, a personal name of uncertain origin.
2. Scottish (Hebrides) and Irish (Fermanagh): Anglicized form of Gaelic Mac Amhlaoibh or Mac Amhlaidh ‘son of Olaf’, from Gaelic forms of the Old Norse personal name Áleifr, Óláfr. Compare McAuliffe.