"Variant of Roseline"
The name Roselyne is commonly a female name from the "German" origin.
Roselyne is a French spelling variant of Roseline, a feminine name formed from Rose with the French suffix -ine. French usage records the name as both Roseline and Roselyne, and the y spelling does not change the derivation. It is not an English formation, which is consistent with its late appearance in United States birth records.
Roseline means "Variant of Rosalind: Compound of 'horse' and 'snake'.".
The pronunciation of Roselyne is ROZ-uh-lin.