Through his mother, Kazan is a direct descendant of classicist and college administrator Thomas Anthony Thacher, Yale president Jeremiah Day, and founding father Roger Sherman.
His sons Sherman Day Thacher and William Larned Thacher were the founder of the Thacher School in Ojai, California; and his daughter Elizabeth Sherman Thacher married William Kent (U.S. Congressman).
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He was also the paternal grandfather of US Solicitor General Thomas D. Thacher and Molly Kazan, and the great-great-grandfather of actress and writer Zoe Kazan.
Thomas Jefferson | Thomas Edison | Thomas | Thomas Hardy | Thomas Mann | Thomas Aquinas | Clarence Thomas | Thomas Gainsborough | Dylan Thomas | Thomas Pynchon | St. Thomas | Saint Thomas, U.S. Virgin Islands | Anthony Hopkins | Thomas Carlyle | Anthony van Dyck | Thomas the Tank Engine | Marc Anthony | Anthony Eden | Thomas Moore | Thomas Cromwell | Thomas Becket | Thomas the Apostle | Thomas Merton | Anthony Quinn | Anthony Braxton | Susan B. Anthony | Anthony Burgess | Anthony Trollope | Anthony | Thomas Tallis |
His father, Thomas Anthony Thacher, LL D. (Yale BA 1835), was professor of Latin at Yale College from 1842 to 1886, and his mother, Elizabeth (Day) Thacher, was the daughter of Jeremiah Day (Yale BA 1795), president of Yale from 1817 to 1846, and Olivia (Jones) Day.