View Message

Clamma is a very rare apparently African-American given name (seemingly short for Clementine) and McClamma is an Americanization of the Scottish name McClammy (derived from Lamont) so these are not good candidates for the origin of Cla(m)as(s)on. If you think that Clementson or one of its variants is a bit of a stretch, remember that you have names like Orbison from Herbertson (via Harbison) or Acheson from Adkinson.