Evelyn Duke Brandenberger in "The Duke Family," privately published, 1979, in her chapter headed Birchett-Lundy Families [of Virginia], states that these Birchett names are variations of the same family name and that they derive from the French name Bouchier. She cites Sir John Bouchier, one of the subscribers of the London Company in 1610-11, as an example of the French form of the name.She went on to include Burtcher, Burchier, Boucher, and even Bushell, and similar forms, as variations of the same Virginia family name.
The family with which Mrs. Brandenberger was concerned was that headed by Edward Birchett, Sr., who lived near Lawnes Creek, Isle of Wight/Prince George County, VA, whose children included Robert (married Mary Platt), Edward, Jr., and Elizabeth (who married James Lundy).Mrs. Brandenberger further notes that it was evidently the widow of this Edward Birchett, Sr., who married (2) John Munger (marriage contract, Isle of Wight County Will and Deed Book 2, p. 71), and she believed this family was closely connected to Daniel Boucher who died in Isle of Wight County in 1668, as his will named "my kinsman Robert Bouchier," presumably the same Robert as the son of Edward, Sr., above.(Not all of this is carved in stone and much more work is needed on the Birchett family.)
Says Mrs. Brandenberger, p. 416: "There were a number of marriages between the families of this area [Lawnes Creek and Appomattox River, Prince George County, on the latter of which Edward Birchett, Sr., had a patent for 351 acres of land in 1672/3], the Batte, Poythress, Parham, Tweat [Thweatt, etc.], and Birchett families."
It may be that many Virginians with names similar to the above are from entirely different families and origins, so Birchett and similar data need to be taken with caution until more reliable facts are established.