Here are some possible translations based on the context:
* Ayan as a name: It can be used as a name, usually for a male. In this case, you can use "அயன்" (Ayan) in Tamil.
* Ayan as a deity: In Hinduism, Ayan is a name for Lord Shiva. In this context, you can use "சிவன்" (Siva) in Tamil.
* Ayan meaning "one who comes": If "ayan" is used in the sense of "one who comes", you can use "வருபவர்" (Varuvar) in Tamil.
To give you a more accurate translation, please provide me with the context in which you encountered the word "ayan".