See also

• William MERCER's parents: William T. MERCER (1812-1886) and Gertrude Ann FRELINGHUYSEN (1814-1886)
• William MERCER's siblings: Charlotte F. MERCER (1836-1895), Gertrude Elizabeth MERCER (1838- ), Frederick F. MERCER (1840-1913), Theodore F. MERCER (1843- ), Archibald MERCER (1847- ) and Dermont MERCER (1849- )