* A misspelling: Perhaps you meant a similar-sounding word, like "Taiji" or "Tijana".
* A name: It could be a name, though not a widely known one. It may be a regional or family name.
* A made-up word: There's a chance it's a fictional or invented word.
To understand the meaning, you'll need more context.
Please tell me:
* Where did you encounter the word "Taija"?
* What was the context surrounding the word?
This will help me figure out what "Taija" might mean.