Over on My Little Pony Collecting, a blog primarily focusing on the older generation stuff, an in depth article on pony names has been written up. It's no surprise that our fanon names just can't be used sometimes. I don't think we will ever see Colgate actually running around as Colgate, but a slight modification to Dr. Whooves (To Dr. Hooves)allowed him to slip on by.
So how exactly does the process work? Look no further than this article to find out!