There are a few possibilities for its appearance:
* It could be a misspelling: Perhaps it is intended to be a different suffix like "-iana", "-ania", or "-onia", all of which are used in various words.
* It could be a specific term in a particular field: Certain areas of study might use "tania" as a technical term, but it is not widely recognized outside of those fields.
* It could be a part of a proper noun: Some names, especially of places or organizations, may contain "tania" as a part of their unique identity.
To understand the meaning of "tania" in a specific context, you would need more information about where you encountered it.