Recorded in several spellings including Yearby, Yerby, Erby, and possibly others, this is an English surname. It is locational from the villahe of Yearby in the county of North Yorkshire near toi the town of Guisborough. The origin is pre 7th century Danish Viking deriving from the words "effn byr" meaning the upper farm. As a village the first recording is in the year 1275 as Uverby and later in 1378 as Overby. The modern spelling is much later being 16th century. Locational names were usually given when a former inhabitant moved to another area, and this also accounted for the variant or differing spellings.