The first known character to Use a Kamehameha was Master Rochi, Goku and Krillin's Mentor, who tought the two that move. Unlike Vegeta, this attack was a light-yellow beam blasted at the target. Cell in his perfect form does a variant of the Kamehameha known as the Solar Kamehameha.
Jet Kamehameha: Performed by Goku in the Namek/Frieza saga, Goku used this move to balance himself and escape Frieza's attack.
Solar Kamehameha- A domelike blast Cell used in the Perfect Cell Saga, against Gohan's Father-Son Kamehameha.
Father-son Kamehameha- A move Gohan and Goku (While with King Kai) used while battiling Cell, which won against Cell's Solar Kamehameha.
10x Kamehameha- A Powered up variant of the Kamehameha, where the user powers up a Kamehameha longer than a regular one, which is larger and more powerful (Duh).