How to handle same class name in different namespaces?

If i do that i will then need to specify the full namespace name before my static class in order to access it?

No, there is no need for that, though the details depend on the class that will use these types and the using declarations it has.

If you only use one of the namespaces in the class, there is no ambiguity and you can go ahead and use the type.

If you use both of the namespaces, you will either have to fully qualify the usages, or use namespace/type aliases to disambiguate the types.

using ERPUtils = MyCompany.ERP.Utilities;
using BCUtils = MyCompany.Barcode.Utilities;

public void MyMethod()
{
  var a = ERPUtils.Method();
  var b = BCUtils.Method();
}