All seven men who have been honored with the retirement of uniform #8 are in the Hall of Fame, and two served as catchers for the New York Yankees.
Bill Dickey, New York Yankees
Dickey played 19 seasons in the Bronx, going to the World Series nine times (and winning eight). Elected to the Hall of Fame in 1954, his uniform number was retired in 1972 when Berra, who also wore #8, was selected for enshrinement in Cooperstown.
Yogi Berra, New York Yankees
Cal Ripken, Jr., Baltimore Orioles
Carl Yastrzemski, Boston Red Sox
Gary Carter, Montreal Expos
Joe Morgan, Cincinnati Reds
Willie Stargell, Pittsburgh Pirates