TYL not everyone is well acquainted with Spanish.

I am a fluent English speaker (in the US for a few decades) who knows Spanish (native speaker of Portuguese which also uses vamos), and thinks about etymology all the time - it never occurred to me lol. I just thought it was some weird old timey american thing lol

I thought it funniest that “vamoose” is even considered a separate thing and not just Americans using a Spanish word

In retrospect, yes, very.