Giants - In 1925, Tim Mara purchased New York's first professional football team for a reported $500. Owner Tim Mara “borrowed” the Giants name from the city's Major League Baseball team of the same name. Mara decided on Giants because his team would play at the Polo Grounds, the home of baseball's New York Giants.
And honestly, we don't know that there wasn't some behind-closed-doors agreement between the two teams that had a cash component going to the baseball Giants.