Why does Winnie the Pooh's house have "Mr Sanders" written above the door?

I believe Mr Sanders was the previous occupant.

http://www.lavasurfer.com/pooh-faq2.html

In the book Winnie the Pooh where we are introduced to Pooh we are given the following explanation why he is sometimes called Mr. Sander.
Winnie the Pooh Chapter 1
Winnie the Pooh and Some Bees
Once upon a time, a very long time ago now, about last Friday, Winnie-the-Pooh lived in a forest all by himself under the name of Sanders.
What does "under the name" mean? asked Christopher Robin.
'It means he had the name over the door in gold letters and lived under it.'