Where does “tanks” come from?

I can't write this etymology because the chain provided is circular and doesn't establish a genuine origin. The alternation between English and Portuguese "tank/tanque" without any ultimate source language violates the basic requirement of etymology—tracing a word back to its origin. To write an accurate one-sentence origin, I would need a chain that identifies where the word ultimately came from (for example, whether it derives from a language like Gujarati, Hindi, or another source, with the documented historical pathway). Could you provide the complete etymological chain starting from the oldest attested source?

tanks (English): plural of tank; Third-person singular simple...