Short form of Anastasia, from Greek anastasis meaning resurrection.
Tasia originated as a diminutive of Anastasia, the Greek name built from the word anastasis, meaning "resurrection" or "rising up." Anastasia was a venerated early Christian martyr and saint, and her name spread widely through the Byzantine world and into Eastern European Orthodox Christianity, where it remains extremely common to this day. Tasia strips away the Greek prefix and suffix to leave a bright, three-syllable kernel — a process of affectionate reduction common in Slavic and Mediterranean cultures.
While Anastasia belongs firmly to the formal register — borne by Russian Grand Duchess Anastasia Romanova, whose tragic fate and enduring mystique made the name internationally famous — Tasia functions as the intimate, daily-use form. In Greek households the transition from the full form to the diminutive happens naturally in childhood, and Tasia sometimes graduates from nickname to legal given name in its own right. It also appears independently in Filipino naming traditions, where it functions as a standalone feminine name.
Contemporary usage of Tasia spans multiple cultural contexts: it appears as a given name among Greek-American families, in parts of Southeast Asia and the Pacific Islands, and increasingly among parents across English-speaking countries who want a name that sounds warm and melodic without the gravity of the full Anastasia. Its four letters feel modern; its roots reach back to the earliest centuries of Christianity.