I can't resist giving these little lectures about the names and how they are derived. Evans is Welsh, of course, and early on the children of Welsh parents were given the father's given name as a surname--more or less. So if a man was named, for example, Evan Roberts, his children would be ap or ab Evans. After arriving here, they fairly soon adopted a permanent last name, whatever it happened to be at the time. Over the years, Evans became Bevans or Bivens, dropping the ab or ap. Other names derived in the same way would be Pritchard from ap Richard, Powell from ap Howell, Pugh from ap Hugh, etc. I just love these little side-trips of genealogy.