While it's difficult to determine the exact origin and meaning of a surname without further research, "Lontok" appears to be a common Filipino surname. There are several possibilities for its origin, including:
* Place name: It could be derived from a place name in the Philippines.
* Descriptive: It could be a descriptive term, perhaps related to a physical characteristic, occupation, or personality trait.
* Nickname: It could have originated as a nickname that eventually became a surname.
If you are interested in learning more about the specific origin of your surname, you could try searching for it online or contacting genealogical societies in the Philippines.