MacDonald, Macdonald, and McDonald are anglicized forms of the Scottish/Irish Gaelic name "Mac Dhomhnuill", a patronymic from the personal name "Domhnall". Domhnall means world ruler and Mac means son of.
In the context of Scottish Clans, the various forms of the name refer to one of the largest clans, Clan Donald.
MacDonald means: Son of World Ruler
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