Slender or keeper of the keys
Kaylan is a modern name with multiple possible roots. It is often considered a combination of the name Kay and the suffix -lan, or a variant of the Gaelic name Caelan, meaning slender. It is also sometimes linked to the Greek name Katherine, meaning pure.
Less common today
Kaylan isn't in the latest US Top 1000. It last peaked at #882 in 1997.
US births per 5-year period, 1990βpresent (SSA data).