quiver on a horse, store
鞬 centers on a container for arrows carried on horseback: a quiver. The store sense is a natural extension of holding and keeping arrows ready.
鞬 combines 革 (leather) with 建, which likely contributes the sound and possibly the idea of setting up or establishing a container. The exact historical development is uncertain, but the leather radical points to a leather quiver.
The leather radical 革 on the left suggests something made of leather, and the right side 建 looks like a structure being built. Picture a leather quiver built to store arrows on a horse.
For ケン, imagine a leather quiver hanging from a horse, and a rider named Ken reaching for an arrow: Ken -> ケン.