There's 2 ways to do that.
1 - Delete the object, go to the respective 3d object and rename it. Create the object again with the new name.
Note: You can't rename a 3d object while it's linked to an object.
Also deleting an object also deletes other records on other tables that are linked to it so you'll also need to recreate them later.
2- Open the following database files in a Hex Editor and change the names there: 3dobject.e3d, entity.eed, object.eod
I prefer and always use method number 2, cause in the end it's just faster.
But it's more risky of breaking the database!
Hope this helps...
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