Agnes is a feminine given name derived from the Greek Ἁγνή Hagnḗ, meaning 'pure' or 'holy'. The name passed to Italian as Agnese, to French as Agnès, to Portuguese as Inês, and to Spanish as Inés. It is also written as Agness. The name is descended from the Proto-Indo-European *h₁yaǵ-, meaning 'to sacrifice; to worship,' from which is also the Vedic term yajña. It is mostly used in Greece and countries that speak Germanic languages. It was the name of a popular Christian saint, Agnes of Rome, which encouraged its wide use.
https://en.wikipedia.org/wiki/Agnes_(name)