"How Common is Your Surname?"
Enter your last name, and see a map of the name's distribution: Surnames in USA
According to the map, there are 10-50 people in Wisconsin with the last name "Baas". The same is true of Minnesota where my family lives. The largest concentration of Baas' appears to be in Michigan where there are between 100-1000 people that share the name.
How well does your surname fare?