Meaning and name origin
Neysa \ne(y)-sa\ as a girl's name is of Greek origin, and the meaning of Neysa is "pure, holy". Neysa is a variant of Agnes (Greek): Latin form of the Greek name Hagnes, from the feminine form of "hagnos".
Neysa 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 Neysa and its variant forms. The only popular variation form ranked in the Top 1000/100 is Agnes. (Source: 2014 Birth Name Statistics).