This article examines the etymology of the Latin cognomen "Caesar", famously associated with Gaius Julius Caesar and later adopted as a title by Roman emperors. It reviews ancient folk etymologies - linking the cognomen "Caesar" to cutting ("caedere"), hair ("caesaries"), or eye color ("caesius") - and contrasts them with modern linguistic perspectives, which emphasize the name’s uncertain but likely Italic origin. Additionally, it is pointed out that the term "caesaries" ‘hair’ might be the derivative of the original noun and its chain of derivation is reviewed. Though its precise origin remains unclear, the name "Caesar" underwent a significant semantic evolution, ultimately becoming a dynastic title and giving rise to imperial terms such as German "Kaiser" and Russian "Tsar".