Here are some possible interpretations and similar words:
* "Tani" could be a misspelling of "Tani" which means "iron" in Kikuyu.
* "Tana" refers to the Tana River in Kenya.
* "Thani" could be a dialectal variation or a word specific to a certain region within the Kikuyu language.
Could you provide more context or examples of how you encountered the word "thani"? This might help determine its true meaning.