Truly common names are those that have originated and evolved with a lay culture. These are legitimate but hardly ever restricted to a single genus or species, especially over a country or continent. Scientific names make it possible for everyone, anywhere in the world, to communicate with each other about organisms. Vernacular names make it difficult or impossible. The same goes for Russia, India, China, and Japan.
Vernacular names lead to scientific and literary isolationism.
Children have no trouble with scientific names, evidence the dinosaurs. Scientific names have meaning and relevance to our language, especially considering the great contribution of Latin and Greek to our common words. Hence, they have educational value. Our science is almost alone in the wholesale manufacturing of vernacular names to please what we perceive as an illiterate public. Sooner or later, we will find that there are more than one vernacular name for a species.