When John Seabrook was born on 21 March 1871, in Wayne, Ohio, United States, his father, George A Seabrook, was 40 and his mother, Mary Ann Rock, was 37. He married Lillian May Neiswinter on 1 May 1899, in Medina, Ohio, United States. They were the parents of at least 1 son and 1 daughter. He lived in Canaan, Wayne, Ohio, United States in 1880 and Perry Township, Stark, Ohio, United States in 1900.
English (Middlesex and Hertfordshire): habitational name from Seabrook in Ivinghoe (Buckinghamshire), possibly from an Old English personal name Sǣga or Old English sǣge ‘slow moving’ + brōc ‘brook, stream’.