The first name Ally is ♀ female and ♂ male.
The girl’s name Ally is a diminutive of several names beginning with “Al-“, e.g. Alice, Alison or Alexandra. In Scotland, it is a masculine name (a short form of Alistair).
Ally means “noble natured”, “of noble type” or “noble person” (from Germanic “adal” = noble + “heit” = kind/sort/type) and “defending men” (from ancient Greek “aléxein/ἀλέξειν” = to defend/help + “anēr/ἀνήρ” = man).