If only the author's first name is known or if the author only uses their first name, only the first name is mentioned.
Ovid. (2011). Metamorphoses (S. McCarter, Trans.). Penguin Classics. (Original work published 8 CE)
Parenthetical citation: (Ovid, 8 BCE/2011)
Narrative citation: Ovid (8 BCE/2011)
Lady Gaga. (2024). Harlequin [Album]. Lil Monsters.
Parenthetical citation: (Lady Gaga, 2024)
Narrative citation: Lady Gaga (2024)