This is not a car, but most people don't know that Lada sold cars in Canada, did not realize it until I saw a Niva in the background of a YouTube Video.
The Ford Explorer and Chevy Blazer (in the UK not in the US.) no one bought big American cars in Britain.
I miss the big American trucks of the 80s. They haven't been forgotten, just not a whole bunch of them are in the road anymore. Also, in the USA Volvos seem to be kinda slipping away into a deep and dark realm of cars nobody really remembers and that aren't that common anymore. I love volvos. :,( --- Post updated --- Thankfully we still have the Explorer in the USA. The chevy, whatever, but we still have that too. Unfortunately Crown Vics are slowly becoming more and more less common. And the blazer and explorer aren't even big cars in the US anymore. If you want to see a big car look at a 2015 Chevy Suburban or a 2010 Toyota Highlander.
I know, When I went to the US two years ago our hire car was a GMC Yukon XL. It was about the same size as a Ford Transit!
Ford Transits aren't even considered huge in the US anymore haha --- Post updated --- In fact, in the USA you need to have something like this just to be at eye level with a lot of other drivers now
Well, it barely got noticed from anywhere else besides Europe until the internet came. Another rarity, except I think you'll BARELY find this car anywhere: The Mercedes Benz 1935 500K.
I'd say the Ford Taurus is rather forgotten, it's a decent Ford still made today, it's just never really appreciated by Ford in any ads, it's like the Camry of Ford, except people know about the Camry
Well, then again, depends if they know about their brother, the Express. Maybe this one could be a more less known car than the Astro: Chevy's Agile.
Here's one I recently found out about: Quantum H4, a kit car based on a Mk3 Ford Fiesta. https://www.h4-turbo.co.uk/Quantum/H4/mykit.html
Had the Corvette not existed, the Pontiac banshee would probably be seen at every local drag strip...