Lylah is a modern spelling of Lila and Leila, names that trace back to the Arabic and Persian laylah and mean "night" or "dark beauty"; the spelling Lilah can also be a short form of Delilah. American parents use the -ah ending to make the pronunciation LY-lah clear. Lylah was almost unheard of in 2000, has been in the top 1000 since 2009, peaked at number 545 in 2024 and ranks number 585 in 2025.