According to House of Names, The Welsh Davis surname is a patronymic, meaning son of David. Ultimately derived from the Hebrew name “David,” meaning “beloved,” the name became a popular given name throughout Medieval Europe due to the biblical king David of Israel. … The name came to be used as a patronymic name by the Brythonic people of Wales.
I have three Davis lines – My main line, with some certainty begin with William Davis born about 1750 in Charles County, Maryland and his family in Pendleton/Abbeville/Anderson, South Carolina. Based on an enormous amount of research compiled by many enthusiastic researchers over the last 100 years, the line tries to incorporate a line of records leading back to Capt. Thomas Davis in the 1600s and connecting through Charles County with Stafford/Prince William County. I have tentatively traced the family back to Brailes, Warwickshire, England to Thomas Davis born about 1530.
The two other Davis lines begin with Dolor Davis born about 1593 in Kent County, England and Mary Davis born about 1590 in Nottinghamshire, England.