Didier is a French masculine given name, derived from the Germanic name 'Theodoric,' which means 'ruler of the people.' It has been widely used in France and Belgium, and to a lesser extent in other Francophone countries. The name gained popularity in France during the Middle Ages and has remained a common choice among French parents today. Didier is often shortened to Didi or Didou as familiar forms.
The name Didier experienced varying popularity over the decades, with a significant increase in usage from the mid-1980s onwards. The most popular years for the name were between 2004 and 2009, with a peak of 51 births in 2009. However, there has been a steady decline in its popularity since then, with only 26 births recorded in 2023.