Cocktail of vodka and coffee liqueur with ice

This is probably the oldest coffee cocktail that exists in nature. Gustave Top, a Belgian, invented it for our joy, but I don't know exactly why he decided to call his creation "Black Russian". The culinary recipe of this cocktail has not changed over the past 60 years. This is done like this:
We take a glass of old fashioned, put more ice in it and pour coffee liqueur first, and then vodka. It is desirable that the liqueur in this cocktail was Kahl