Hi Roy
I'm not the moderator, but felt that I could give a reply to your question as I was one of the users who originally complained about duplicate names. The problem occurs when more than one person is replying to a thread, but using the same name. For example I have added to thread that already had another 'mick' on it. This makes it very confusing for other readers, especially if the advise or opinions given are contradictory. Most forums won't allow duplicate names, so anyone else trying to register as Mick or mick for example wouldn't be allowed. This is what the comments were about. It's not about which names to use, it's about the forum allowing more than one user with the same name. Unfortunately there isn't an unlimited number of 'real first names' so duplication is inevitable.
The old system of the moderator checking each entry before posting is unworkable, unless someone was doing it as a full time job. Sometimes it took several hours before a reply would be posted. Not much good if you want a quick reply. And a thread could go on for days, instead of being 'wrapped up' within a few hours.
Not sure about publishing Surnames as being against the Data Protection Act. The web is full of surnames, and I doubt that they all gave permission before they were used. The Electoral Role is public domain as far as I'm aware (may be wrong), so anyone can get your information anyway.
Personally I couldn't care less if anyone wants to know my surname. There are dozens of people in the UK who share my name, and it's in the phone book anyway. It's held on hundreds of databases, so what's the problem in a few users on a friendly forum knowing it? What are they going to do with it?
As you say the important bit is helping others with problems and giving information. It seems to be back to how it used to be which is great.