"Blend of Kay and Lynn"
The name Kayelyn is commonly a female name from the "American" origin.
Kayelyn is a modern American formation built from the elements Kay and Lynn, with a linking e between them. Kay is an established given name that also serves as a first element in twentieth-century coinages such as Kaylee and Kayla, and Lynn appears as a second element in names of the same period. The result follows the pattern of Kaylyn and Kaylynn, and the spelling with the medial e is a later variation of that group.
The pronunciation of Kayelyn is KAY-lin.