His cousin once removed (Edward Griffin's grandson) was football player Harvey Rexford Hitchcock, Jr..
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His distant cousin was Harvey Rexford Hitchcock (1800–1855), who was an early missionary to Hawaii.
Harvey Rexford Hitchcock, Jr. (generally known as H. Rexford Hitchcock) was born in 1835 and published a dictionary of the Hawaiian language while principal of Lahainaluna School, in an effort to teach Hawaiians the English language.
His paternal grandparents were Edward Griffin Hitchcock (1837–1898), son of Reverend Harvey Rexford Hitchcock (1800–1855), and Mary Tenney Castle (1838–1926), daughter of Castle & Cooke founder Samuel Northrup Castle (1808–1894).