Collection name is pretty important, it is used a lot in RavenDB.
By conventions, we use the first part of the key as the entity name, if you didn't specify one, and to make it nice, we capitalize the first letter.
Consider something like "users/1" which will be converted to Users
If you don't want that, you need to explicitly set the "Raven-Entity-Name" in the metadata to the desired value.