Étienne Geoffroy Saint-Hilaire originally gave this species the specific name of egyptiacus in 1810, but he later revised it to ægyptiacus. In 1992, G. B. Corbet and J. E. Hill argued that this revision was invalid and changed the name back to egyptiacus; the 1999 Mammalian Species review used egyptiacus as well. However, Geoffroy's revision was argued to be valid in 2001 by D. Kock. He notes that the second spelling was "accepted almost universally by the scientific community", including by the first reviser, Knud Andersen, who used ægyptiacus and wrote that egyptiacus "may [. . . ] be considered a slip or misprint corrected by the author himself". Even if it was an unjustified emendation at first, it became a justified emendation through widespread use according to the ICZN Code since the use of aegyptiacus was undisputed until Corbet & Hill. Kock also writes that since the Latin adjective for "Egyptian" is aegyptiacus, egyptiacus is a simple misspelling in the original description. Books like Mammal Species of the World and Mammals of Africa follow Kock and use the name aegyptiacus. The Agreement on the Conservation of Populations of European Bats was amended to use the specific name aegyptiacus in 2003.