Family name origins & meanings
- English : from Old French dague ‘dagger’ (of uncertain origin), hence a metonymic occupational name for a maker or seller of daggers, or a nickname for someone who carried one. Middle English Dagger is a later development of the same word. The surname was taken to southern Ireland in the 17th century.
- Scottish : on the evidence of the early spelling Dog, Black believed this possibly to be a form of Doig.
- German : from a personal name based on Old High German tac ‘day’.