The name Gregory originates from Latin, derived from 'gregarius', meaning 'watchful' or 'alert'. Introduced to England by the Normans in 1066, it gained popularity during the Middle Ages due to its association with several early saints and popes. In the United States, Gregory reached peak popularity mid-20th century, with some recent resurgence. Variations include Gregor, Greggory, Gregorio, and Gregoria for females. Notable bearers of this name span from six popes to philosophers like Mendel and Bateson, and actors such as Peck.