Davis is a surname of Welsh origin.
Dyfed is recorded as a surname as late as the twelfth century, e.g. Gwynfard Dyfed, born 1175.
Dafydd (generally translated into English as David) appears as a given name in the thirteenth century, e.g. Dafydd ap Gruffydd (1238–1283), Prince of Wales, and Dafydd ab Edmwnd (fl.
Alternatively, Davis may be a patronymic surname (son of David).
[1] According to the 2000 United States census, it is the seventh most frequently reported surname, accounting for 0.48% of the population, preceding Garcia and following Miller.