He was collaterally related to Thomas, the 6th Lord Fairfax, who relinquished his English estates to his brother, Robert, and emigrated to America, where he settled on a plantation of more than a million acres (4,000 km²) in Virginia, which he inherited from his mother, Catherine Colepeper.
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In 1685, Fairfax married Catherine Colepepper, daughter of Thomas Colepeper, 2nd Baron Colepeper, and they had seven children: Thomas Fairfax, Henry Colpepper Fairfax, Katherine Fairfax, Margaret Fairfax, Frances Fairfax, Mary Fairfax, Robert Fairfax.
The 7th Baron, Robert Fairfax, died without issue in 1793 and the title descended to an American second cousin, the Rev. Bryan Fairfax (1736–1802), was a priest of the Episcopal Church and rector of parish in Alexandria, who was the son of William Fairfax(1691–1757) of Belvoir and Deborah Clarke (1707–1747).