I don't know about Somerset, but all the names you are mentioning and the history tie in with the Wexford, Ireland Sinnotts of Ballybrennan and Ballymoyer, including the fact of them being granted land - but I only know of this in Wexford, rather than Somerset or Lincolnshire. Check out this link for a start
http://www.irishgenealogy.com.ar/genealogia/S/Sinnott/sinnott.php
