What you are seeing is the DLNA media player/client on the smart TV using the metadata from the file rather than the file name. This is normal when it comes to using DLNA media server/client. You can use a metadata editor (like Media Monkey or MP3Tag for example) to edit certain media file type’s metadata to correct (or remove) metadata information.
You may want to review the following thread that has much more information on using the My Cloud DLNA (Twonky) media server.
https://community.wd.com/t/faq-twonky-dlna-media-server-setup-use/95373
