* Томми (Tommi) - This is the most common and straightforward transliteration. It's based on the English spelling and uses the closest Russian letters.
* Том (Tom) - This is a shortened version, similar to how people sometimes call "Tommy" just "Tom."
* Томас (Tomas) - This is a more formal option, using the full name "Thomas" in Russian.
The best spelling will depend on the context and how you want to convey the name.