Jailyne is a modern American spelling of Jailyn, a blend of the Jay sound with the "-lyn" ending that traces back to the Welsh word for "lake". The spelling with final e is especially popular among Hispanic families, where it is pronounced with a clear long i. Jailyne stood far down at number 11150 in 2000, rose to its best rank of 1837 in 2017 and sits at number 2945 in 2025.