[GraemeJ]

I have a similar problem, only with keys. I work with a lot of different vocalists (who all do much the same repertoire, but not always the same key and/or arrangement). I found it best to name the file "whatever tune - key.pdf". I then use the 'Custom' field to further differentiate (in my case, usually by vocalist). When displayed on the tablet, I see:

whatever tune - key [vocalist]

That way, all the versions are together, e.g.;

My Romance - Am [Elena]
My Romance - Gm [Nicole]
My Romance - Am [SueK]
and so on.

The last one is a different arrangement to the other Am version.

This means I can quickly select by the vocalist (assuming it's someone I work with regularly) or by the key required.

In your case, I think I would be inclined to place the Smith, Jones, etc., in the 'Custom' field.