The elephant and snake/dragon are connected with indra which shows us the keris Vedic origins. The Keris blade is described in terms of a snake in motion or a snake in meditation depending if it is straight or not. Note that the Keris also represent Heaven and earth. The keris also is/was given offerings to insure it held its power. The snake and elephant can also be seen on Tibetan Phurbas, ancient Indian daggers and Keris (note the Indian influence in all). Indera was the god worshiped by the ancient Warriors of India. The whole thing points towards a strong Indian influence in keris. Also note that the first Keris in Indonesia appeared with the coming of Indian rule.
The Keris has its origins in ancient India, it represents the mystically charged thunder bolt weapon held by Indera.
"Indra is the chief deity and the god of war and rain, the greatest concerns of the people at that time. He separated the heavens and the earth by defeating Vrtra, a snake-dragon representation of chaos and obstacles. Another Vedic myth describes his defeat of Vrtra using wind and a thunderbolt as his weapons, enabling the monsoon rains to end. Indra must be strengthened with the drink soma, provided by worshippers, to accomplish this task. "
http://www.religionfacts.com/hinduis...vedic_gods.htm