From Apple
2. - 3 PERFORMANCE: ACCURATE METADATA
Performance - 2.3.7
Your app name to be displayed on the App Store includes keywords or descriptors, which are not appropriate for use in an app name.
Specifically, the following words in your app name are considered keywords or descriptors:
Easy Coloring Book Coloring Fun Learning Games For Kids Ninja Toys Letgo Edition
Next Steps
Please revise your app name to remove any keywords and descriptors from all localizations of your app. Keywords can be entered in the Keywords field in iTunes Connect to be used as search terms for your app.
Resources
For information on how to revise your app name, please see Renaming a Project or App.
For information on changing the app name and other metadata in iTunes Connect, please see the section, "Viewing and Changing Your App's Metadata", in the iTunes Connect Developer Guide.