Jolyon, derived from the Norman French name Gaulois, was quite popular during medieval times, particularly among the nobility. It is composed of two elements: 'Gaul', meaning 'France' or 'Frenchman', and '-ish', a suffix denoting belonging to or having the qualities of. Therefore, Jolyon translates roughly to "French-like" or "of French character". This name was often used as a byname for someone who exhibited characteristics associated with France or the French people. Today, while not among the most common names, Jolyon remains a unique and historical choice for individuals seeking a distinctive moniker with roots in medieval Europe.
"Jolyon experienced peaks in popularity with nine births in 1970 and seven in 2012, while seeing lower numbers between 1972 and 2014, with totals reaching thirty-one over the recorded period."