Prince Harry and Meghan Markle revealed their royal baby's name yesterday on Instagram. Baby Sussex's name is Archie Harrison Mountbatten-Windsor. Mountbatten-Windsor is a surname used by some members of the royal family.
The couple did not choose an aristocratic title for the baby, who is not a prince but could have been given a title with "Lord" before his first name. The couple did not disclose why they had chosen the names though the meaning of Harrison, "son of Harry," could be a clue.