A variant of Anastasia, from Greek, meaning resurrection.
Anastassia is a richly layered variant of Anastasia, one of the great names of the Christian Greek world, built from the Greek anastasis, meaning "resurrection" — the rising again from death. It was a name that carried enormous theological freight in early Christianity, given in honor of the resurrection of Christ and associated with Saint Anastasia of Sirmium, a Roman noblewoman martyred in the early fourth century whose feast day falls on Christmas Day in the Latin church.
The name spread rapidly through the Byzantine Empire and the Eastern Orthodox world, taking deep root in Russia and the Slavic nations, where the diminutives Nastya and Nastia became terms of everyday affection. The name reached its most dramatic modern moment with Grand Duchess Anastasia Nikolaevna, the youngest daughter of Tsar Nicholas II of Russia, executed with her family by Bolshevik forces in 1918. The persistent legend — fueled by decades of uncertainty and several convincing impostors before DNA evidence finally closed the question in the 1990s — that Anastasia might have survived gave the name a romantic, mysterious aura that no other name of the twentieth century quite matched.
The 1997 animated film further embedded Anastasia in popular consciousness as a name of resilience and wonder. Anastassia, with its doubled s, reflects Eastern European and Russian orthographic traditions, giving the name an aristocratic, literary depth while keeping it visually distinct — a name that feels simultaneously ancient and alive.