I've seen two people with the same name and birthday, in different departments of the same building. Caused regular problems with management and HR.

I've also seen two different customers with the same name and phone number - the number got recycled and went to second one while the first hadn't updated their number on file. We had to tell them apart by address.

But why are filenames equated with spacetime coordinates? That doesn't make any sense - reflect on why you leaped to that analogy. The spacetime coordinates are the disk ID and sector number. We've been using operating systems that work a certain way for so long that we think filenames are like spacetime coordinates.