SongKong is designed to identify and rename music files, and it can recognize them if the audio has no ID3 tag and is named "track1.mp3" using Acoustic Fingerprinting
It can be used on a collection of any size, and runs without requiring any other software on OSX and Windows.
It is not free, but you can use the free trial to generate a html report showing exactly what every song has been matched, you could then use this to manually edit your tags or buy the software and have it do it for you.
This video shows the matching process in action
Disclaimer:I am the SongKong developerI am the SongKong developer.