Here are a few snippits from vol 5 of A BRASHEAR(S) FAMILY HISTORY (not yet published), which shows that David Walker was a son of David Walker and Rachel Durant, who was a niece of Alexander McGillivray, principal chief of the Creeks.
Family of Samuel Brashears Sr and Rachel Durant:
v51. 81. *Alexander M. (?McGillivray) Brashears, b. c1789 (61 in 1850, Mobile Co, AL, #491-491); m.1. ________; m.2. Ann Brashears, his cousin, d/o Zaddock Brashears Sr; m.3. 15 Jul 1826, Marengo Co, AL, Emiline Jane Winn, m.4. Brambly Cravey, b. c1810-19 (31 in 1850), d/o Hugh Cravey and Kessy Norsworthy. Alexander was a beneficiary under Clause 14 of the Treaty of Dancing Rabbit Creek. See below.
v52. 82. *Samuel Brashears Jr, b. c1792; may have married three times, and may have died after 1846. Samuel was recognized by the U.S. Government as a "warrior of the Creek Nation" and was a beneficiary of the treaty of 1814, which ended the Creek War. See below.
Family of Billy McGirth and Rachel Durant:
v53. 83. William "Billy" McGirth Jr
Family of David Walker and Rachel Durant:Rachel m.3. 1803, David "Davy" Walker Sr (ref: The First American Frontier, by Albert Pickens James, v.2, p.8-11). David "Davy" Walker, died between 1821 (birth of son, David) and 1824 (Rachel's marriage to Zadock Brashears Sr).
v54. 84. George W. Walker, m. 19 Jan 1832, (Sumter Co, AL "by Cainon Pistole, JP"), Mrs. Rebecca (Juzan) Bond, widow of John Bond; (Rebecca D. Juzan m.1. John Bond, 25 Feb 1825, Marengo Co, AL, Marr. Book A, p.83; Alexander Brashears was security. On 14 Oct 1833, George W. Walker was appointed guardian of Thomas, James L., and Louisa Bond.)
v55. 91. Thomas J. Bond, step-son to George Walker
v56. 92. James L. Bond, step-son of George Walker
v57. 93. Louisa Bond, step-dau of George Walker
v58. 94. William Walker,
v59. 85. Benjamin Walker, m. Sybell Juzan, d/o John Charles Juzan
v510. 86. Martha Walker, m.1. 20 Mar 1824, William LeFlore, s/o Louis LeFlore and Rebecca Cravatt, grand-niece of Apuckshunubbee (Marengo Co, AL Marr; Cornelius H. Vawter, Security)
v511. 87. Sarah Walker, m. 19 Sep 1820, J.H. Miller (Marengo Co, AL; Alex McGrew, bondsman)
v512. 91. Robert Miller,
v513. 92. Martha Miller, m. 17 Dec 1838, Alexander M. Brashears Jr, s/o Alexander Brashears, s/o Samuel Brashears Sr and Rachel Durant.
v514. 88. Henrietta Walker,
v515. 89. Sophia Walker, m. c1830, Dennis Payne,
v516. 810. David Walker Jr, b. c1821
From Mrs. Pauline Gandrud's typed work: "Records of Marengo Co, AL":
Rachel Brasheers, Alexander Brasheers, and Samuel Brashers Jr, all of Marengo Co, except Samuel Brashears Jr, who resides in Monroe Co, AL: ten slaves that were deeded to above Alexander Brashears and Samuel Brashears by our father Samuel Brashears Sr, we wish our mother Rachel Brashears to enjoy them, after which they are to descend to her younger children, viz: the heirs of Sarah Miller, deceased, viz, Robert and Martha Miller; Martha LeFlore; George Walker; David Walker; Henrietta Walker. 11 December 1826, recorded 12 Dec 1826, Marengo Co, AL, Deeds, Book A, p.3098. Why weren't the two youngest children, Sophia and David Walker, included in this deed? In 1831, Sophia and David are listed as step-children in the household of Rachel's fourth husband, Zadock Brashears Sr, in Sumter Co, AL, with Alexander Brashears and Allen Stanton as witnesses (American State Papers, Indian Affairs).