Business Name Question - Confusing

This is a bit confusing but hopefully I can explain it properly........a number of years ago I created a corporation in Illinois. About six months ago I dissolved this corporation. Now I want to restart the same type of business but want to open it as a sole proprietorship (with the hopes of converting to a LLC in a number of years if the business takes off)). To open a sole proprietorship I only need to file with our county. My question is whether or not I can use the same name, or do I need to create a new one. I never had any clients (did open a bank account and applied for an EIN number though). Thanks in advance!