Caylan is of Scottish origin and means 'slender'. It's derived from the Gaelic word 'cailean', which translates to 'slender, fair-haired'. This given name was popularized by its usage in the novel 'A Secret History' by Donna Tartt.
The name Caylan experienced a gradual increase in popularity from the late 80s to the mid-90s, peaking in 1995 with 20 births. However, it has since declined and hovered around 5-7 births per year more recently, totaling 246 births overall.