Dow surname as been long assoicaied with Dove, Duv, of LeDuv.There are records of a Richard Le Duv and a Nicholas le Duv in England ca. 1200. The origin is thought to be "dove" - a name used for people with gentle demeanor. The same occurred in Italy. Christopher Columbus was a "dove" - (colombo is It. for dove). Spelling variations seemed to solidify within an area - with it being Dowe in Norfolk. In Hants it was Doue. It is a common name in Norfolk - and is pronouncedwitha longer "o" there. The common pronuncuation in America (rhymes with cow) is a result of yankee twang. The earliest spelling as Dow is 1505, in England. Henry Dow of MA Bay Colony actually used Dowe, Dove, and Dow! There is also the name Dhu - but that is the Daw family of Scotland - not Dow.