Where does “Kamehameha” come from?

Kamehameha is a Hawaiian name of unknown etymology, derived from Hawaiian ka.

Ancestry of “Kamehameha”, step by step

Step	Language	Word	Meaning
1	Hawaiian	kā	to strike, hit, thrust, dash, hurl; container;...
2	Proto-Polynesian	taʻa	—
3	Proto-Austronesian	taqan	to hold back; to keep in reserve