Confusion Reigns

I received an email from someone by the username of chewhg. It got me puzzled for quite a while. The problem grew intense because the email was from .au. I was a bit relieved when I was asked whether it was snowing in Canberre when it was 3deg in Perth. That narrowed the field by a mile. It suddenly dawned on me that it could be from David but he was from Singapore. I then settled with the idea that David had moved to Perth from Singapore.
The revelation came the following day in a reply from the guy who sent the email.
It was Stewart. I then wrote the following message to him--

How silly of me. You left out your christian name. Confusion certainly took over me for quite a while. Stewart and Chew Huat Guan are the same person. (Repeat 100 tiimes) I am familiar with Stewart because I have tasted his excellent char koey teow but Chew Huat Guan is new to me. Sorry mate.
Please let me into the difference between Huat Guan and Huat Hock? I have not heard from David for a long time. He must be a very busy man.

Reminder:; please don't , whatever you do , don't leave your Christian name out. The username can be very very confusing. Mine is wdberg.