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Re: 'Clammasson' (+ variants)
I have no direct evidence but Clammasson and its related forms look suspiciously like alterations of Clementson 'Clement's son' or one of its many variants, e.g., Clemetson, Clemison, Clemson, etc.
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You could be right, but I also found Clamma in use as a female name. I didn't find any meaning however. Also I found Clamma and Mc Clamma as a surname.Clammas is an English dialect word:
CLAMMAS, V. To climb (n.Cj'.).
http://www.archive.org/stream/englishdialectdi01wrig/englishdialectdi01wrig_djvu.txt
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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.
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