呉
ゴ, く.れる, くれ, ぐ
give, do something for
JLPT1 G7 S7 F1729
The relevant seal inscription form is 口# mouth + a head leaning forward → mouths figuratively intersecting in rowdy conversation. The pronunciation of the character simulates the sound of animated conversation, or quarreling. The ancient Chinese kingdom of Wu (Japanese: *Go*) is a borrowed meaning → *China*.
[Full Kanji Etymology List]