I know its not the same as having the actual name ( like say Ford Harvest Gold ), but if you have an original cover, then I am sure there are plenty of body places that can take a small sample and scan the colour and match it. I know my prefered car body shop can do this.
Like I said, it wont have a name that it can be refered by, but if you will get a paint code that can be ordered again and again.
Now all you need to do is ensure you have an original cover that’s the original colour to match.
Just a though.