What is Zack and Cody's last name?

What is Zack and Cody's last name?

The series is set in the Tipton Hotel in Boston and centers on Zack and Cody Martin (Dylan and Cole Sprouse), a set of twins who live at the Tipton Hotel.

Does Cody ever get into Yale?

Unfortunately, he is not accepted into Yale. It was revealed in "Rollin' with the Holmies" that Cody is a big fan of Sherlock Holmes and is the president of the Boston "Sherlock Holmies".