The Find-A-Grave page for Thomas[3] and the Pane-Joyce Genealogy[4] (as well as a significant number of family trees) state that Thomas Bourne of Marshfield was the Thomas Bourne who was the son of a Bartholomew Bourne of London. The origin of this theory was probably the January 1873 NEHGR article "Rear Admiral Nehemiah Bourne"[5] and the January 1897 NEHGR article "Genealogical Gleanings in England,"[6] which both contain summaries of the 1609 will of John Bourne, citizen and baker of London, which includes a bequest to Thomas and Maudlin Bourne, the children of son Bartholomew. The problem with identifying Thomas, son of Bartholomew, as the same person as Thomas Bourne of Marshfield is that (i) there is no evidence connecting the two and (ii) as discussed in the profile for Thomas, son of Bartholomew, it highly likely that he was born sometime in 1597-1608, most likely about 1605, and certainly much too late to have been Thomas of Marshfield, born about 1581. (From https://www.wikitree.com/wiki/Bourne-2)