William UNDERWOOD 
- Born: 1606, , , ENG 1
- Christened: St. Stephen, Walbrook, London, Middlesex, ENG
- Marriage (1): Margaret MASAN  about 1619 in St. Giles, London, England 1 2
- Marriage (2): Margaret CRAWFORD  about 1629 1
- Marriage (3): Margaret ROBERTS  on 3 Jan 1632 in St. Giles, Cripplegate, London, ENG
- Died: Bef 1650, London, Middlesex, ENG
William's christening date is in question from my point of view. There is a christening record in St. Stephen, Wallbrook, London, England that is very difficult to decifer. It has been indexed as Willisennt Underwood, son of Edw(ard) on May 15, 1606. I suggest that because this is where Edmunds other children were christened that this has been misinterpreted in the index and should actually be William Underwood, son of Edmund. A family tree record gave his birthplace as Kent in 1606 and his christening on Apr. 19, 1612 also in St. Stephen isntead. I do not know which is correct. I have not been able to find an Edward having any other children in St. Stephen other than what is listed as Willisennt.
This generation and his children is conjecture on my part from traditions passed down in this family combined with patterns of early Underwoods living in this country.
I have found part of the children listed here as children of William Underwood and Margaret Masan in the family ancestral files at www.familysearch.com: Anne, William, Elizabeth, Sarah, Margaret and Mary. However, that source also lists him with 3 wives named Margaret, two of which he married in VA and the 3rd in England. If this is true, then some of them were children of his 2nd or 3rd wife. This family obviously needs work.
It's entirely possible that the family that includes William as a child is simply a different branch of Underwoods that does not include our Thomas directly. However, as they have his first wife marrying him in 1621 and they do not have any listed children before 1629, I'm suggesting that Thomas and George also belong in this family. They came over on the same ship at the same time... and both disappeared from Old Rappahonnak Co, VA records after their arrival. There is a tradition passed down in the family that Thomas was one of 3 brothers that migrated together, with all 3 dispersing in different directions after they arrived.
Here is a record for a land purchase that William made in Virginia provided at http://www.combs-families.org/combs/assoc/u-1.htm by the COMBS-COOMBS &C. RESEARCH GROUP. "2 Nov 1659. Old Rappahannock. "I, Will UNDERWOOD of Rappahannock County with the consent of Mary my wife," for the sum of 120 pounds Sterling money paid according to the tenor of a contract dated 30th May 1659 conveyed unto Capt. Richard LOES and Rice JONES a plantation lying on the north side of Rappahannock River.....uppermost half of the lowermost half whereof I formerly sold unto ........eads (mutilated) dec'd this land adjoining the land of Coll FAUNTLEROY known by the name of Mangorick and on the eastermost side of Bushwood Creek and runneth for length into the woods NE and by E and by the River NW and by W, to hold the said plantation thereto with all houses, outhouses Edifices thereon erected (the Courthouse excepted), containing 650 acres or thereabouts, and all gardens, orchards and fences ---- unto the said Capt. Richard LOES and Rice JONES. Teste: John CATLETT and Tho. GOODRICH (Vol. 1656-64, p. 70, Rappahannock Records)."
Margaret Mason, his wife, married John Upton after William's death. John Upton's will names some of Margaret and William Underwood's children: William, Elizabeth, Sarah and Margaret. (C-2403)
William married Margaret MASAN  [MRIN: 4348] about 1619 in St. Giles, London, England.1 2 (Margaret MASAN  was born in St. Giles, London, England 2 and died after 1656 of Rappahonnak, VA.)
William next married Margaret CRAWFORD  [MRIN: 4361] about 1629.1
William next married Margaret ROBERTS  [MRIN: 4362] on 3 Jan 1632 in St. Giles, Cripplegate, London, ENG.