Kacelyn is a modern invented name, given to around 15 girls every year. It combines the unisex Kacey with the popular suffix, -lyn, giving it the possible meanings "brave in battle, but soft and tender too"; "vigilant one by the lake", or "watchful and pretty", depending on which etymological roots you decide you want to blend. 
 While Kacey (and its spelling variants, Kasey, Kayce, and Casey) are out of style for girl as of 2023, Kacelyn follows the pattern of Raelynn, Katelyn, and Gracelyn, which might mean it sees more use.
 Kacelynn V is musician who bears the name.

Kacelyn

Kacelyn Origin and Meaning