Inês is the Portuguese form of Agnes, a name of Greek origin meaning "chaste." The name traces back to the Greek hagnos (ἁγνός), which was Latinized as Agnes. Renowned for its association with Saint Agnes, a virgin martyr under Emperor Diocletian (c. 291 – c. 304), the name became widespread in Christian Europe. Popular etymology linked it to Latin agnus ("lamb"), leading to the saint's iconographic depiction with a lamb. Ines dates back to medieval Iberia and is particularly established in Portugal and Portuguese-speaking countries.