"Jo" is the only two-letter English word that begins with the letter J. It is a noun of Scottish origin that means "beloved one," "darling" or "sweetheart." The plural form of the word is "joes."
There are a few two-letter words found in other languages that start with the letter J. "Ja" translates to "yes" in both German and Afrikaans. The word "je" is a French subject pronoun that corresponds to the word "I" in English. "Ju" is a word used in the phonetic spelling of Chinese characters. It means a Confucian or a tutor of aristocratic origin who worked during the Chou dynasty.