I think it's gorgeous, but I prefer the spelling Roselyn. I also love the similar Rosalie.
Rosalyn/Roselyn Grace
Rosalyn Claire
Rosalyn Vera
Rosalyn Katia
Rosalyn Amelia
Rosalyn Theresa
Rosalyn Carolina
Rosalyn Elisabeth
Rosalyn Katrina
Anything strictly feminine sounds great with Rosalyn.