Pure lake
A modern American compound name combining the phonetic elements of Kay and Lynn. Kay is often derived from Katherine, meaning pure, while Lynn is a common suffix or name derived from the Welsh word for lake.
Less common today
Kayelynn isn't in the latest US Top 1000. It last peaked at #5,382 in 2008.
US births per 5-year period, 1990βpresent (SSA data).