Joeline is of French origin, derived from the masculine given name Joel. It means "Yahweh is God" or "God is merciful." This name gained popularity as a feminine form in France during the late 20th century and has since been adopted by other countries as well. The variant spelling Jolien is also used.
"Joeline was quite popular from the mid-80s to the late-90s, with peaks in 1987 and 1988."