Day surname meaning
An English surname most often linked with the Middle English dairy worker, with additional personal-name and place routes.
Confidence: Likely. The main story is well supported; some details of the deeper root are less certain.
The short story
Day is most often explained as an English occupational surname from Middle English day or dey, a dairy worker responsible for cattle and milk. The same spelling also arose from personal-name forms: Dai or Day can represent David or the Welsh Dafydd, while Dey had other regional uses. French place-name routes and Irish or Scottish Gaelic adaptations add further variety. Dey, Dai, and Daye are neighboring documentary forms, not proof of one family. Occupation is the best catalog type because the dairy meaning is a strong lead, but likely confidence keeps the personal-name and geographic routes visible. A Day family needs local records before one origin can be assigned.
Also seen as: Dey, Dai, Daye, Dae
- Ancestry, Dictionary of American Family Names entry 'Day' (dairy-worker, personal-name, and place routes)
- Wikipedia 'Day (surname)' (English and Welsh surname histories)
- Names2020_LastNames_RaceHispanic_Top1000.xlsx (2020 Census)