Save Gender Feminine Usage English (Modern, Rare) Pronounced Pron. onna-STAY-shuh, onny-STAY-shuh [key] Other Forms FormsAnistacia, Anistassia, Anastasia, Anastacia, Anastasiya, etc. Meaning & History Variant of Anastasia. Anistasia was given to 5 girls in 2014 according to the SSA.