I don't know about the Greek translation. In Latin, "agnus" is "lamb".
And by the way. Totally different perspective. Agnes must have lived to be at least 71. Maybe even longer. As a nun, she had no children. The record-breaking Queen of Bohemia died in her 18th childbirth at the age of 45. Being a nun meant she could have lived to an older age. And at that time, more than half of all children did not live to adulthood. Getting married meant not only giving birth, but also mourning the children who died. This too must be taken into account.
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