Jolien is a name of Belgian origin, derived from the French 'Julienne', which itself is a diminutive of Julia. It means 'downy-haired' or 'soft-haired'. The name Jolien gained popularity in Belgium and the Netherlands during the 1970s, and has since been adopted in other parts of Europe as well.
"The name Jolien was quite popular in the late 2000s with 6 babies named Jolien each year in both 2007 and 2008."