According to English-Indonesian dictionary at m.kapanlagi.com/kamus/ the word "kerambit" means small sickle. It is a farm implement adapted as personal weapon.
I find it really interesting that the kerambit is far more popular here than in Indonesia. The most common traditional weapons still in use today in Indonesia AFAIK are badik (pistol-handled dagger), golok (short machete), parang (long machete), and kerambit's nastier and bigger brother: the clurit (sickle).
What western silat practitioners don't always tell you is that the kerambit and clurit excel at disembowelment. Few things deflate your attackers' will to fight like seeing his entrails on the floor. They're basically large gut hooks.