Dallasm & fEnglish From a surname that could either be of Old English origin meaning "valley house" or of Scottish Gaelic origin meaning "meadow dwelling". A city in Texas bears this name, probably in honour of American Vice President George M. Dallas (1792-1864).
DaltonmEnglish From an English surname that was originally derived from a place name meaning "valley town" in Old English. A notable bearer of the surname was John Dalton (1766-1844), the English chemist and physicist who theorized about the existence of atoms.