Several years ago, Bhante Sujato said some interesting things about the origins of the Gotama/Gautama gotra, and their mythological connection with king Okakka (Ikṣvāku), who is sugar, personified.
First, the Sakyans having the name Gautama is often used to suggest a connection with Brahmanism, since Gautama is the name of one of the ancient rishis. He’s the legendary originator of a a textural and ritual lineage to which the Sakyans are supposed to have belonged.
Yet the Sakyans show little to know signs of having embraced Brahmanism. I haven’t come across a single sutta where the Buddha has a discussion with a Brahmin within Sakya. (If you know of any, please let me know. I may have missed something.) When the Brahmin Ambaṭṭha visited Kapilavatthu, the Sakyans were highly disrespectful, giggling at him and not so much as offering him a seat. And the importance of trees in the Buddha’s life (and the earliest-known Sakyan shine having been a tree) suggests they may have been animists rather than followers of the Vedas.
In puzzling over the origins of the gotra name, Gautama, I noticed that RIshi Gautama is credited with creating the Godāvarī river, one branch of which is called the Gautami. (His other claim to fame is giving Indra 1000 vaginas ) This river myth is explicitly tied to irrigation and agriculture.
The Gautami flows through the states of Telangana and Andhra Pradesh. Both of these are important sources of sugar cane in India. And their position on India’s east coast makes them a likely site for the introduction of sugar cane from New Guinea, which is (apparently) where sugar cane originated.
So the Gautama legend is to do with irrigating crops in an area where sugar is a main crop — moreover, an area where early (i.e. several centuries before the Buddha) importation of sugar-cane might well have taken place. And the Okakka legend is connected with sugar. These two legends concerning the Sakyans may, therefore, be connected.
So, maybe the Buddha’s ancestors had some historical connection with the Gautami river, and took their name from there rather than directly from the rishi? Perhaps an ancestor came from there?
This is wildly speculative, of course, but we’re talking about myth, and it’s hard not to think “creatively.” In fact it’s kind of essential.
Your thoughts are welcomed.