How are you getting the book to the Kindle? If you are using Calibre to send the book then the name on the Kindle should match the name in Calibre. If you are copying using OS level facilities then that might explain what you are seeing as simply changing the name in Calibre does not affect the file on disk in the Calibre library, it merely updates the information stored in the Calibre database.
If you want to update the embedded metadata without doing a conversion use the Polish Books feature after changing the name in Calibre.
You can also use metadata-plugboards to do much fancier alterations of the title/author during the process of sending the book to the Kindle.
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