Is there a way to recover MP3 file names?

Hi! I just ripped a ton of MP3’s from my old failing iPod so I could transfer to a new machine. Now all of my music has 4 letter file names (like ABCD.mp3). Is there a way to recover the original name or some data from the file as to it’s contents? Is there some kind of FREE software out there that could do this for me? It is a lot of files. What would this process be called? Thanks!