Ku is a name of Japanese origin. It means "nine" in Japanese. The name Ku has been used for both boys and girls in Japan since ancient times. However, it became more popular as a girl's name after the Meiji Restoration in the late 19th century. Today, Ku is still a common name among Japanese families, but it is not as popular as some other traditional Japanese names like Sakura or Hana. There are no significant historical figures named Ku that have contributed to its popularity or meaning over time.
The name Ku has seen varied usage over the years in the United States. In 1986, there were 5 babies named Ku. The number of newborns with this name fluctuated slightly over time, with peaks occurring in 1989 and 2018, when 7 and 6 births were recorded respectively. The most recent data from 2015 shows that the name Ku was given to 5 babies. Overall, since 1986, there have been a total of 33 newborns named Ku in the United States.