Pure or keeper of the keys
Kailynn is a modern American invention, likely created by combining the name Kai with the popular suffix -lynn. While its roots are multifaceted, it is often associated with the Greek name Katherine, meaning pure, or the Welsh name Kay, meaning keeper of the keys.
Less common today
Kailynn isn't in the latest US Top 1000. It last peaked at #901 in 2011.
US births per 5-year period, 1990βpresent (SSA data).