Meaning and name origin
Agnessa \ag-nessa, agne(s)-sa\ as a girl's name is of Greek origin, and the meaning of Agnessa is "pure, holy". Agnessa is a variant of Agnes (Greek): Latin form of the Greek name Hagnes, from the feminine form of "hagnos". A baby name that is only intermittently used.
Agnessa is not a popular first name for females and an equally uncommon surname or last name for all people (Source: 2000 U.S. Population Census).
Displayed below is a comparison of the popularity of the girl name Agnessa and its source form. The only popular variation form ranked in the Top 1000/100 is Agnes. (Source: 2014 Birth Name Statistics).