Allessia is a ♀ female name.
Allessia is a variant of Alessia, which is an Italian name (a short form of Alessandra or a feminine form of Alessio).
Allessia means “defending men” (from ancient Greek “aléxein/ἀλέξειν” = to defend/help + “anēr/ἀνήρ” = man).