In this paper, we discuss the ecosystem of naming systems for smart spaces. Since we think resolution of detected object names should be a common trigger of smart space applications, we focus on naming systems. We aim at a naming system framework to enable the following. First, each application developer of smart spaces can design and implement new applications freely. Minimal limitations should be imposed on developers. Second, users can interact with applications opaquely. We propose combination of the following two approaches to induce naming systems evolution for smart space applications. The first approach is integration of independent naming systems for simple client resolvers. The second approach is a client resolver model to handle independent naming systems concurrently. We also describe some case studies concerning smart space application scenarios.