When it comes to English letters, some of them are just much more popular than others. According to recent research, the most common letter in the English language is the letter E. E typically takes first place regardless of which analysis method is used. E’s frequency is likely because it appears in the word the, the many plurals that end in -es, and is commonly used in pronouns such as he, she, me, we, and they. The list of the top 10 letters used in the English language typically consists of the following letters: E, T, A, O, I, N, S, R, H, and L.

Source: Thesaurus.com