Is There a Days Coat of Arms?
People named Days carry a Welsh surname with a long history. Smith's 1956 dictionary gives the meaning “descendant of Dai, a pet form of Dafydd (beloved)”. It is a patronymic: it named a person after a father or forebear.
1,678 Americans were listed as Days in the 2010 census. Names that sound alike, such as Dias and Dacy, are easily confused in old records.
There is no single Days family crest for all bearers; the honest first step is to find out which Days line, if any, bore arms. Get the complete Days report, with a museum-style coat of arms.