Originally, yes. So were aspirin, heroin, kerosene, hovercraft, linoleum, and a bunch of other common words.

The brand was cazeline, according to https://en.wikipedia.org/wiki/Gasoline#Etymology

It is not. “Gasoline” is what Brits should call the substance they put into their vehicles. Petroleum is not what goes in them, that is just an unrefined version of gasoline.

Edit: Petroleum, not patroleum.