The name Rosalyn is a girl's name . Rosalyn is ranked #903 on our popularity charts and is often added to lists like Girl Names Ending in Lyn and discussed in our forums with posts like "A brother or sister for little Jack or Olivia - with middles!".
From the experts:
True Blood may be the reason that variation Rosalyn has retained some popularity while the original Rosalind still languishes. Moderately popular in the middle of the last century, Rosalyn may deserve its revival but we still prefer the more classic Rosalind.