4200 to 4000 B.C. would be before Armenian had emerged as a distinct language. It’s part of the Indo-European language family, which seems to have been spoken in what is now southern Ukraine and southern Russia about that time, but some experts have argued that the ancestral language to Proto-Indo-European might have been spoken further south earlier, so it may have included the area of Armenia.
Same kind of issue exists for pretty much all antiquities, including those of the Americas (named for Amerigo Vespucci), Egypt, Britain...