The name "Kai" has various meanings and origins across different cultures. In Hawaiian, it means "sea," while in Japanese, it can mean "ocean" or "shell." In some Native American cultures, it signifies "willow tree." The name is often used for both boys and girls, making it a popular unisex choice. Kai has gained popularity in recent years, especially in Western countries. It is often associated with qualities like strength and calmness, reflecting its meanings related to nature. Notable people with the name include Kai Greene, a professional bodybuilder and actor, and Kai L. Greene, a well-known artist.