✔ 最佳答案
Latinized form of the Greek name ‘Αγνη (Hagne), derived from Greek ‘αγνος (hagnos) meaning "chaste". Saint Agnes was a virgin martyred under the Roman emperor Diocletian. The name became associated with Latin agnus "lamb", resulting in the saint's frequent depiction with a lamb by her side
sources:
http://www.behindthename.com/name/agnes