Hack Miller (Cubs 1922-1925) got his nickname because of he looked like a famous Russian wrestler of the era, Hackenschmidt. His real first name was Lawrence. He was a short squat guy, about 5'9, 200 pounds, but he was tough as nails and strong as can be. His father was a circus strongman (Sebastian the Strongman), and Miller used to entertain his teammates by bending iron bars, smashing large stones and hammering nails through 2-inch thick boards with his fist. After he retired from baseball, which happened pretty quickly—he was amazingly slow, he became a longshoreman. He only played six seasons in the majors, but his career batting average was .323.

Hack Wilson(Cubs 1926-1931) actually wasn't nicknamed Hack because of his swing. He got his nickname when he was in the minors with the Giants. His teammates thought he looked like an outfielder on the Cubs named Lawrence Miller (above)--but he also looked a little bit like the wrestler Hackensmidt (after whom Miller was nicknamed). Wilson was the perfect fit for Chicago in the roaring twenties. Read more about the Cubs Hall of Famer here.