His grandson, William C. Alexander (1848–1937), was an executive with the Equitable Life Assurance Society, author, and founder of Pi Kappa Alpha Fraternity.
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His second son, William Cowper Alexander (1806–1874) served as president of the New Jersey State Senate and as the first president of the Equitable Life Assurance Society.
Archibald Alexander, a professor at the college, was its first professor and principal.
Alexander the Great | Alexander Pope | Alexander | Alexander Graham Bell | Alexander Calder | Alexander Pushkin | Alexander von Humboldt | Alexander I of Russia | Alexander II of Russia | Alexander Hamilton | Alexander McQueen | Alexander II | Pope Alexander III | Jason Alexander | Archibald Prize | Alexander I | Alexander Korda | Alexander McCall Smith | Pope Alexander VI | Alexander von Humboldt Foundation | Alexander III of Russia | Alexander Alekhine | Alexander Mackenzie | Alexander Haig | Alexander Frey | Lloyd Alexander | Alexander Scriabin | Alexander III | Alexander Fleming | Alexander Borodin |
During his presidency, such speakers as Princeton educator Archibald Alexander (himself a graduate of Liberty Hall, the predecessor of Washington College), Minister Elias Lyman Magoon, and Professor George Dabney delivered graduation addresses at Washington College.