Dempsey is a masculine given name of Irish origin, derived from the Irish surname Ó Dabhthaigh, which means "descendant of David." The name gained popularity in the United States during the 20th century, particularly after World War II. It has been used consistently throughout the decades and continues to be favored by parents today. In recent years, it has appeared more frequently among English-speaking countries like the United States, Canada, Australia, and the United Kingdom.
"Dempsey has seen a significant surge in popularity as a baby girl's name since the late 1990s, with a notable peak of 37 births in both 2013 and 2015. However, it remains relatively uncommon overall, with an average of around 16 births per year over the past decade."