Like the theory that William Shakespeare is not the real author of many plays in his body of work, but rather another contemporary of his, also named Shakespeare, I believe there’s a similar misconception regarding the true authorship of Gulliver’s Travels.
Indeed, there was a man called Jonathan Swift (1667–1745, Irish satirist, essayist, poet and the Dean of St Patrick's Cathedral, Dublin,) but it is unclear if Lemuel and Mary Gulliver ever knew of him, and why they chose that particular pseudonym. (Though I expand on my theory in Footnote 33, in Chapter Four.)
Swift himself used the pseudonym of Isaac Bickerstaff.
Confused? You ought to be…