Who was the Baby Ruth candy bar named after?

Although the name of the candy bar sounds nearly identical to the name of the famous baseball player, Babe Ruth, the Curtiss Candy Company has traditionally claimed that it was named after President Grover Cleveland's daughter, Ruth Cleveland. Nonetheless, the bar first appeared in 1920, as Babe Ruth's fame was on the rise and long after Cleveland had left the White House and 16 years after his daughter had died. Moreover, the company had failed to negotiate an endorsement deal with Ruth, and many saw the company's story about the origin of the name of the bar as merely a way to avoid having to pay the baseball player any royalties. Ironically, Curtiss successfully shut down a rival bar that was approved by, and named for, Ruth, on the grounds that the names were too similar in the case of George H. Ruth Candy Co. v. Curtiss Candy Co, 49 F.2d 1033 (1931).