“Mononym” combines the Greek “monos,” meaning “alone,” with the suffix “-onym,” referring to a name. A mononym (one-word name) is often a first name, but celebrities are always stretching the limits. First-name-only celebs include Madonna (Louise Ciccone), Beyoncé (Giselle Knowles), and Prince (Rogers Nelson). Some — including magician (Raymond Joseph) Teller and musician (Stephen) Morrissey — use their last names. Other mononymous stars, including Sting, Bono, Pink, Lorde, and Eminem, use nicknames or names they’ve chosen for themselves.