The meaning of the word "ku" is: the legendary name of an ancient emperor.
Emperor Ku (kù) (2275 BC - 2176 BC), Gaoxin's surname, Ji, Ming Jun, Huaxia clan. Born in Gaoxin (now Gaoxin Town, Suiyang District, Shangqiu City, Henan Province), he was named Gaoxin. He was the great-grandson of the Yellow Emperor. He was the leader of the tribal alliance in ancient times and one of the Five Emperors. He was the prototype of the Emperor of Heaven in "The Classic of Mountains and Seas".