Which English letter was last to join the alphabet?
The correct answer is: D! How many of you answered Z? It’s okay, that question was a bit tricky. The letter J was in fact the last letter added to the alphabet. Believe it not, the ancient Roman alphabet had no J. The formal distinction between the letter J and the letter I was not established until the 17th century! Currently, the letter J is the fourth-least frequently used word in the English alphabet.