sword
劔 centers on a sword, specifically a double-edged blade. It is a variant form of 剣, carrying the same core meaning of a cutting weapon.
劔 is a variant form of 劍, combining 僉 (a phonetic component) with 刄 (blade), indicating a cutting weapon. The exact historical development of this particular variant is uncertain, but it belongs to the same family as 剣 and 劍.
The left side 僉 looks like a collection of people (口 and 人), and the right side 刄 is a blade. Imagine a sword that unites many warriors under one sharp edge.
For ケン, picture a swordsman named Ken wielding this double-edged blade: Ken -> ケン, and his sword is always ready.