When Sylvester James Shannon was born in 1865, in Wisconsin, United States, his father, James Shannon, was 34 and his mother, Hellen Ellen, was 32. He had at least 5 sons and 1 daughter with Johanna F Josephine Flatley. He lived in Winchester, Winnebago, Wisconsin, United States in 1880 and Holland, Brown, Wisconsin, United States for about 30 years. He died on 2 June 1944, at the age of 79, and was buried in Askeaton, Brown, Wisconsin, United States.
shortened form of Shanahan .
shortened Anglicized form of Gaelic Ó Seanáin ‘descendant of Seanán’, a personal name based on a pet form of seán ‘old’. This Irish surname became established in Scotland in the 14th century.