Naming conventions for extension objects in Dynamics 365

Hi,

There are some rules to name a new object when we need to develop or customize for a company.  As we know the concept of extension has been introduced in Dynamics 365 version, I would like to know what the naming conventions should be for an extension?

For e.g. If we need to create an extension of CustTable, it creates the object as CustTable.Extension by default. But this is a new object in AOT that will be created in VAR later or any specific layer. If I have created this extension object for company XXX, should we name it as CustTable.XXXExtension? Or any other convention is already there? 

Thanks in advance.