This was the name of a 13th-century Italian saint who made clothes for the poor. As an English name, it has never been common.
This name has also functioned as an Anglicized form of Scottish Ruaridh or Welsh Rhydderch.
As a given name, it took off in popularity during the 1990s. It has been more common for girls in the United States probably because of its similarity to other names such as Megan, Morgan and Regan.
During the 20th century, Graham was more common in the United Kingdom, Australia and Canada than it was in the United States. However, it has been rising on the American charts since around 2006.