Which letter is the most common in English? Please write a few sentences about anything in English and then check how many times each letter has appeared in it. The letter “e” has the best chance of winning. According to Lexico (Oxford Dictionaries) the letter “e” is the most popular letter in the English language. It occurs in over 11% of words. The second most common letter is “a”, which is found in 8.5% of English words. The least common letter is “q”, occurring in only 0.2% of words.