Changing the song name will not show as Track info.
If you are using Itunes to rip songs, select the song and right click and set the properties - Song Name, Category, Genre, Artist etc etc.
After that the music player will recognise the song info and show as part of tract info while playing. The file name is just that - a file name.
In fact if I have a song file called "track1.mp3" and it has the track info set (as I mentioned above), the correct song name will show while playing and not the file name - "track1".