Jack Chapman debuted on May 5, 1874 and played his final game on August 8, 1876.
Jack Cullen debuted on September 9, 1962 and played his final game on May 5, 1966.
Jack Damaska debuted on July 3, 1963 and played his final game on July 20, 1963.
Jack Egbert debuted on April 21, 2009 and played his final game on May 28, 2012.
Dempsey was a boxer, not a baseball player. May have done exhibition work at fairs and carnivals.
Jack Berly debuted on April 22, 1924, playing for the St. Louis Cardinals at Sportsman's Park IV; he played his final game on September 24, 1933, playing for the Philadelphia Phillies at Baker Bowl.
Jack Faszholz debuted on April 25, 1953 and played his final game on May 30, 1953.
Jack Chapman debuted on May 5, 1874 and played his final game on August 8, 1876.
Jack Cullen debuted on September 9, 1962 and played his final game on May 5, 1966.
Jack Damaska debuted on July 3, 1963 and played his final game on July 20, 1963.
Jack Egbert debuted on April 21, 2009 and played his final game on May 28, 2012.
Jack Aker debuted on May 3, 1964 and played his final game on September 27, 1974.
Jack Albright debuted on May 19, 1947 and played his final game on July 27, 1947.
Jack Allen debuted on May 1, 1879 and played his final game on July 17, 1879.
Jack Aragon debuted on August 13, 1941 and played his final game on August 13, 1941.
Jack Baker debuted on September 11, 1976 and played his final game on June 8, 1977.
Jack Baldschun debuted on April 28, 1961 and played his final game on August 21, 1970.