Except that aubergine does mean eggplant today, in England as well as the French-speaking world. Nobody will ever use aubergine to refer to a kind of peach, just to refer to an eggplant. The root of the word makes no difference. I would bet that there are very, very few people who know that the root refers to peaches, and it doesn't really matter.
That's like saying it's a great idea to name your son
Adolph because it means "noble wolf", when really the name has come to be synonymous with evil.