Anglicized form of Gaelic Domhnall. The final -d of the Anglicized form derives partly from misinterpretation by English speakers of the Gaelic pronunciation, and partly from association with Germanic-origin names such as Ronald. This name is strongly associated with clan Macdonald, the clan of the medieval Lords of the Isles, but is now also widely used by families with no Scottish connections.
French (Breton) and English (of Norman origin): from a personal name, a contraction of Tanneguy, from Breton tan ‘fire’, and ki, ‘dog’, which was borne by a 6th-century Christian saint associated with Paul Aurelian. The name was introduced to England at the time of the Norman Conquest.