The last name at birth (LNAB) is set at the name of Metacom's Native American tribe, Wampanoag.
Metacom,2 alias Pometacom, who accepted from the English the name of Philip, but now better known in history as King Philip. The date of his birth is unknown. He m. Wootonekanuske, a sister of Weetamoo. What I have been able to glean of the personal histories of both, appears in former pages of this book. He was killed in battle near Mount Hope, in what is now the township of Bristol, Rhode Island, Aug. 12, 1676. He had a son whose name at this time cannot be certainly ascertained. This son, while yet a child, was captured by the English and sold into slavery."
King Philip's War, sometimes called the First Indian War, Metacom's War, Metacomet's War, or Metacom's Rebellion, was an armed conflict between Native American inhabitants of present-day New England and English colonists and their Native American allies in 1675–78... named for the main leader of the Native American side, Metacomet, who had adopted the English name 'Philip' due to the previously-friendly relations between his father and the original Mayflower Pilgrims. The war continued in the most northern reaches of New England until the signing of the Treaty of Casco Bay in April 1678...'"
"Metacom’s coalition, comprising the Wampanoag, Narraganset, Abenaki, Nipmuc, and Mohawk, was at first victorious. However, after a year of savage fighting during which some 3,000 Indians and 600 colonists were killed, food became scarce, and the indigenous alliance began to disintegrate. Seeing that defeat was imminent, Metacom returned to his ancestral home at Mount Hope, where he was betrayed by an informer and killed in a final battle. He was beheaded and quartered and his head displayed on a pole for 25 years at Plymouth..."
"August 12 1676 This was perhaps in reality the most memorable of all the days of King Philip's war being the date at which he sealed his devotion to the principles of pure patriotism with his life's blood having before sacrificed on the altar of his country's freedom nearly all that men usually hold near and dear He had already been reduced to poverty in every thing almost save principle and had nothing more to give but his dying efforts to save his country from the white man's covetous grasp and the small remnant of his people from a most degrading bondage All that man could give to save his country King Philip cheerfully contributed property power his best and unyielding efforts unabated even when deprived of wife child kindred and nearly all his followers and friends and last of all he gave his life What patriot ever could do or ever did more At the date of King Philip's death his forces had become so much reduced in numbers that he was being constantly driven from place to place and early on the morning of Saturday August 12 1676 Capt Church and the soldiers under his command found King Philip and the small but faithful remnant of his once powerful band in a swamp near Mount Hope or what was then called Pokanoket now Bristol RI The knowledge that this place was his temporary refuge was communicated to the English by a traitorous Indian called Alderman Capt Benjamin Church in his history of this transaction printed in 1716." 
↑ Peirce, Ebenezer W. Indian History, Biography and Genealogy: Pertaining to the Good Sachem Massasoit of the Wampanoag Tribe, and His Descendants. North Abington, MA: Zerviah Gould Mitchell, 1878, p. 210. Electronic copies of this source are available at https://archive.org The Internet Archive