give, grant, bestow, surname
貺 centers on giving something valuable or bestowing a favor. The surname sense is a separate application of the same character.
貺 combines 貝 (shell, money, value) with 兄, which likely contributes the sound. The character expresses giving something of value.
The left side 貝 represents money or treasure, and the right side 兄 suggests an older brother. Picture an older brother giving a valuable gift.
For キョウ, imagine a generous older brother giving you a gift in Kyoto: Kyoto -> キョウ, and the gift is bestowed.