Roselyn is an English spelling of Rosalyn or Rosaline, a medieval name usually explained as "gentle horse" from the Germanic hros and lind, but long understood as a blend of Rose and Lyn, "rose" and "lake". The actress Roselyn Sánchez and the first lady Rosalynn Carter kept the sound familiar. Roselyn peaked at number 612 in 2004, dipped out of the US top 1000 in 2024 and returns at number 979 among girls' names in 2025.