Creative spelling of Tanya, a Slavic diminutive of Tatiana, which derives from the Roman Tatius clan name.
Tanyja is a creative spelling of Tanya, a Slavic diminutive of Tatiana, which in turn derives from the Roman Tatius clan name. That long path gives the name an unexpected amount of historical depth beneath its short, modern surface.
The altered spelling makes Tanyja feel more individualized and visually distinctive. It keeps the compact, lively sound of Tanya while giving it a slightly more decorative finish. The result is a name that feels both familiar and personalized, with a modern stylistic edge.