In the original Locomotion, the first coal mine near a town named London (for example) would be named "London Coal Mines". The second (and so on) would simply be named "Coal Mines 1", unless there was already a coal mine with that name anywhere in the world, in which case a larger number would be used.

My suggestion is that the second coal mine near a town named London should instead get the name "London Coal Mines 2" when generated in future versions of OpenLoco.

Or more generally, industries should be named "[town name] [industry type] [lowest positive integer needed to avoid a duplicate name, omitted if this number is 1]"

Additional context
Implementing this properly would incidentally also count as a fix for #2434. It may also involve finding out what is causing that bug.