Meaning and name origin
Agnus \ag-nus\ as a girl's name is of Greek origin, and the meaning of Agnus is "pure, holy". Agnus is a variant of Agnes (Greek): Latin form of the Greek name Hagnes, from the feminine form of "hagnos".
Agnus is a somewhat popular first name for females (#4094 out of 4276, Top 96%) but an uncommon surname or last name for all people (2000 U.S. Census).
Displayed below is a comparison of the popularity of the girl name Agnus and its variant forms. The only popular variation form ranked in the Top 1000/100 is Agnes. (2014 statistics).
A suggested similar baby name is Annus. This name tends to be less commonly used than Agnus.