William Farrar IV was the last Farrar born on Farrar's Island, VA. He was also the last Farrar owner of the island, which he sold to Thomas Randolph on 05 Feb 1727 after his wife Sarah relinquished her dower rights. The Farrar family had owned the island for 90 years

In return for the sale of Farrar's Island, William Farrar IV was to receive "land on the north side of the James River in the Parish of St. James and county of Henrico (which later became Goochland County) between Dover Mill and Stoney Creeks, an estimated 600 acres." (Dr. Malcolm Hart Harris quoting Winfrey's "Acts of the Assembly"). When William Farrar IV moved from Farrar's Island, Henrico County, VA , his new plantation was also located in Henrico County at that time. Shortly there however, his land became a part of Goochland County, VA which was created in 1728 from Henrico County. When William Farrar IV passed away years later, his land was located in Goochland County, not Henrico County, VA.

William Farrar IV's plantation remained in his family for three generations, finally being sold to his grandson, William Farrar, in 1804; in 1914, this land became known as "Rochambeau" after the French General who was with General George Washington at Yorktown.

It is known today as Rochambeau Farms on the Manakin Sabot Road, Richmond, VA. However, the farm was recently sold to a developer and is no longer in existence.

William Farrar IV married his cousin Sarah Farrar, daughter of Thomas Farrar and Katherine Perrin

Issue:
1.William Farrar V m. Mary Williams dtr of Nathaniel Williams
issue: Salley, Nathaniel, Nansie and Frances
2.Joseph Farrar m. Susannah Jordan issue: Joseph, Charles, Susannah

3.Perrin Farrar m. Sarah Lacy, Issue: Mary Ann, Matthew, Stephen, Sarah, Lucy, Elizabeth, Frances

4.Richard Farrar m. Elizabeth Sanders, 1749, issue:
a.Richard Farrar II m Phoebe Young issue John Sanders Farrar, George Young Farrar.
b.Stephen Farrar b. 1756 m Catherine Lansford, Issue:
Henry Lansford Farrar, Thomas, Stephen David Jr, Nancy, Elizabeth, Judith
c.Shadrack Farrar b 1757,died 1780 RWS
d.Priscilla Farrar b 1759
e.Rene Farrar b 1761
f.Seth Farrar
g.Renard Farrar
h.Elizabeth Farrar
5. Thomas Farrar, Sr m. ? Issue: William, Joseph, Mary

Some genealogies would have it that William married Sarah Perrin, but Sarah Perrin (dtr of Richard Perrin father of Katherine Perrin married Stephen Cocke)
The assumption that he married Sarah Perrin is based on the fact that
one of their sons is named Perrin and another named Richard, but that would be the case if the mothers grandfather was named Richard Perrin.