After much contemplation, he (Akira Toriyama ) could not decide on a name for his “Kame” attack, so he asked his wife (Nachi Mikami), who came up with the name.[12] She told Akira that it would be easy to remember the name of the attack if he used the name of the cultural Hawaiian king named Kamehameha (lit. “the very lonely one” or “the one set apart” in Hawaiian language).

https://dragonball.fandom.com/wiki/Kamehameha