Pure or slender
Kaelah is a modern phonetic variant of Kayla. It likely derives from the Gaelic 'caol' meaning slender, or as a diminutive of Katherine, meaning pure.
Less common today
Kaelah isn't in the latest US Top 1000. It last peaked at #3,581 in 2002.
US births per 5-year period, 1990βpresent (SSA data).