Gentle horse or beautiful rose
A modern variation likely blending the Germanic elements of Rosalind, meaning 'gentle horse', with the popular 'lyn' suffix. It is also frequently associated with the Latin 'rosa' for the rose flower.
Less common today
Rosilyn isn't in the latest US Top 1000. It last peaked at #9,392 in 1990.
US births per 5-year period, 1990βpresent (SSA data).