'Kei' — Say 'KAY, it's a blessing!' when you receive a favor.
The top part of 恵 looks like a hand (十) putting a gift (口, like a box) into a field (田, simplified), and below it is the heart (心) from which favors and blessings flow.
Vocabulary
恩恵おんけい
blessing, grace, favor
知恵ちえ
wisdom, intelligence
恵むめぐむ
to bless, to show favor, to grant
恵みめぐみ
blessing, grace, bounty
恵比寿えびす
Ebisu (one of the Seven Lucky Gods; also a place name in Tokyo)