blessing, grace, favor, kindness
惠 centers on giving something good to others: a blessing, grace, favor, or kindness freely offered.
惠 is the older traditional form of 恵. It combines 心 (heart) with a phonetic element that also suggests giving or bestowing. The modern simplified form 恵 is more common in Japanese.
The bottom is 心 (heart). The upper part looks like a hand offering something. Picture a heart giving a gift from the hand: that is a blessing or kindness.
For ケイ, imagine a kind person named Kay who always gives blessings: Kay -> ケイ, and her heart is full of grace.