If a name would not be easily mistaken for something else, the initial “Ka” or “Ke” would sometimes be dropped. It is important to think of these things when searching for people and places. How many written examples have you come across?
Kawaiahao → Waiahao
Kekuanaoa → Kuanaoa
Kaahumanu → Ahumanu
Kaumualii / Kaimualii → Imualii
Kamoiliili → Moiliili