MLB's award for the best reliever in the American League is named after which pitcher?

What position did Ken Griffey Jr. mainly play? What position did Mariano Rivera play? What position did Edgar Martínez mostly play, becoming the award's namesake? MLB's award for the best designated hitter is named after which player? MLB's award for the best reliever in the National League is named after which pitcher? MLB's award for the best hitter in each league is named after which player? Which player was the first to hit 500 home runs? Which player was the first African American manager in MLB, hired by Cleveland in 1975?