You certainly have a right to sue him, but the procedural trick is that you have to be able to serve the summons and complaint on him and to do that you need to know where he lives or works.
If you cannot find him, you can serve him by publication. But you will first have to show other efforts to find him, and the publication process is more expensive than the normal service process. But you can do it. The question is whether it will be worth it to you given the amount at stake.