From the blog "Working On The Slave Trade"
The Slaver's Spellbook now has an MCM page.
There's not a lot to it as yet
But it does a few things. You can stop the Brand spell from auto-renaming your slaves. And you can set a preffix and suffix for the names.
So if I change that
... and then re-apply the brand, we get a new name
Poor old number six. I think I might maker her keep that name for a w