There are no known records of George Dillard's birth. If he was aged 18 when he was brought to Virginia by Captain Moore Fantleroy, he was born, say, 1632.
Dorothy Hughes reports that several records of George Dillard appear in Nugent's Cavaliers and Pioneers. 
1650 Headright of Captain Moore Fountleroy
George was a headright of Capt. Moore Fantleroy on 22 May 1650 (p. 195), through his acquisition of land in New Kent County, which fell into King and Queen County when it was created in 1691. 
George had a wife when the two sold 76 acres of New Kent County land in 1679. 
22 May 1650 – According to Nugents' Cavaliers and Pioneers George Dillard was one of 107 headrights of Capt. Moore Fantleroy in Virginia 
"George landed at Jamestown in the Virginia Colony after a voyage from England in 1650, or shortly before, likely as a young, illiterate indentured servant (as were most immigrants of that period). 1650 was, indeed, very early in the colonization of the North American continent, and as such, George would be considered one of the original settlers. 
"On 10 October 1652, Unknown Dilliard was one of 12 persons whose transportation receipts were turned in by Elias Edmonds, so that he patented 600 acres of land in Lancaster County, across Rappahannock from the Middle Peninsula, where King and Queen County is located. Was this man George? It could have been, but there is no way to know." 
29 November 1665 - Cavaliers and Pioneers also reports that George Dillard patented 250 acres of land in New Kent County, Virginia (later King and Queen County when created in 1691), adjoining land he was living on. This was the result of a headright grant for transporting Jno. Richardson, Peter Stone, Margtt. Williams, Martha Wms. (Williams), Wm. Worts. 
2 September 1675 – Dorothy Dillard Hughes reports that on this date George Dillard and eleven others served on a jury in Stratton Major to determine that the land of a man who died without heirs should excheat to the King. 
1679 Sells Land, Wife Consents
20 September 1679 - Cavaliers and Pioneers reports that George Dillard and his wife sold 76 acres to John Lane by deed. Unfortunately, George Dillard's wife's name is not found in this or any records. 
1694 King and Queen County
20 April 1694 - Cavaliers and Pioneers reports that George Dillard patented 139 acres in King and Queen County, noting that if George Dillard Sr had died by this date, it could refer to a second George. 
1704 King and Queen County
1704 - George Dillard (or a second George if he died before 1704) was on the 1704 Quit Rent Roll as owner of 325 acres in King and Queen County.
The 1704 Quit Rent Rolls, published in several books, are really a census of Virginia landowners. Every landowner had to pay the King an annual quit rent of one shilling per fifty acres. Names included were Nicho. and Edwd. Dillard and Thomas and Geo. Dillard in King and Queen County and William Dolerd (Dellard/Dillard)) in New Kent County. (Isle of Wight County records show that Henry Dullard was Henry Bullard.) Dillard/Dolerd names were found only in adjoining counties of King and Queen and New Kent. Yet none of the Dillard landowners except George are in genealogies published before 1960. 
There are 4 Dillards found in the 1704 Quit Rent Rolls in King and Queen. This is the basis for the speculation that they are his sons. The lands held by all 4 were in close proximity to each other:
George Dillard, born 1658 = George, either the founder or a possible son George, with 325 acres in 1704 
Dorothy Dillard Hughes, in her now-defunct database has the children as:
Thomas Dillard was born about 1668.
Edward [Dilliard] Dillard was born about 1672.
Nicholas [Dilliard] Dillard Sr. was born about 1674 and died about 1742.
William [Dellard] Dollard was born about 1677 and died on 24 Oct 1709.
James [Dellard] Dollard was born about 1683.
Four profiles have previously been linked as children of George Dillard or his disproven alternate. No documentation has been found to link these profiles as the children of George Dillard, and they have been de-linked.
This is the profile for the George Dillard for whom documented information can be found. See George Dillard for a George Dillard, about whom a substantial amount of legendary information has collected, and whose existence is considered disproven.
No named wife of George Dillardl or the legendary George Dillard is known, although it is known that he married. Therefore links to the following profiles have been broken:
There is a William Dellard that appears in St. Peter's Parish, New Kent and his death of Oct 24, 1709 is listed both St. Peter's Parish and Christ Church Parish, Middlesex. Dorothy Hughes Dillard stated that William Dellard may have been intended to be Dillard. Her extensive research in the recopied register of St. Peter's Parish by a clerk may have uncovered important facts about the "e" in Dellard being recopied as "o" and made into Dollard. She states that Dellard for Dillard was a common error of the times. https://texashistory.unt.edu/ark:/67531/metapth39869/m1/30/
↑ 1.01.11.21.3 Cavaliers and Pioneers, cited by Dorothy Dillard Hughes
Dillard in Print: Fact or Fantasy. Texas State Genealogical Society. Stirpes, Volume 33, Number 4, December 1993, periodical, December 1993; Sulphur Springs, Texas, pages 16-24; Accessed November 1, 2019)
↑ Nugent, Nell Marion. 1963. Cavaliers and Pioneers: Virginia Land Patents and Grants 1623-1660 Baltimore: Genealogical Pub. Co., 1963, originally Richmond, Virginia, 1934. Volume I, pp. 194-195, in Patent Book 2, p. 231. Cited by Dorothy Dillard Hughes,
↑ Dorothy Dillard Hughes. Dillard in Print: Fact or Fantasy. Texas State Genealogical Society. Stirpes, Volume 33, Number 4, December 1993, periodical, December 1993; Sulphur Springs, Texas, pages 16-24; Accessed . November 1, 2019), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting Texas State Genealogical Society.
↑ Nugent, Nell Marion. 1963. Cavaliers and Pioneers: Virginia Land Patents and Grants 1623-1660 Baltimore: Genealogical Pub. Co., 1963, originally Richmond, Virginia, 1934. Volume 1, p 541, Patent Book 5, p.456.
↑ Hughes, Dorothy Dillard. 1999. Dillard research notes: Culpeper county, Virginia Dillards and related families of South Carolina. Houston, Tex: D.D. Hughes.
↑ Nugent, Nell Marion. 1963. Cavaliers and Pioneers; volume 2 abstracts of Virginia land patents and grants, 1666-1695. Baltimore: Genealogical Pub. Co. p. 240
↑ Nugent, Nell Marion. 1963. Cavaliers and Pioneers; volume 2 abstracts of Virginia land patents and grants, 1666-1695. Baltimore: Genealogical Pub. Co. p. 372
↑ 9.09.19.29.39.4 Smith, Annie Laurie Wright. 2004. The quit rents of Virginia, 1704. Baltimore, Md: Reprinted for Clearfield Co. by Genealogical Pub. Co.
Hughes, Dorothy Dillard. 1999. Dillard research notes: Culpeper county, Virginia Dillards and related families of South Carolina. Houston, Tex: D.D. Hughes.
My D'illard History and Genealogy of Virginia, North Carolina, Tennessee and Georgia. D'illard Coat Of Arms. 
It may be possible to confirm family relationships with George by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with George: