Hi Harry
I'm thinking that the McCleans listed in the directories may be brothers or nephews of our Daniel as the names keep repeating themselves. One James may be the brother you listed in your first post (who married 3 times) and the others may be his sons.
I believe Presbyterians named their children strongly after their family names - I have one great example of that, my Andrew Alexander family from Glendermott Londonderry had 10 children and each one named their first born son after their father Andrew - must have been fun at family gatherings! At least the sons of the female Alexanders had different surnames!
The Adam McClean you referred to is a mystery, that name hasn't come up before but he may be a brother of Daniel's father William named from his mother's side.
The 1805 directory has only these 3 entries for McClean
McClean, S. and A., merchants, (1) Sugar House Entry writing
McClean, William, spirit merchant, 188 North Street - (I believe this is probably Daniel's father)
McClean, Adam, woollen draper, 68 High Street
Is this one of your Murrays from the same directory?
Murray, Timothy, soap and candle manufacturer, 172 North Street (just a few houses from William!!!!)
My great aunt claimed a connection to the Lindsay Spinning Mills of Belfast but she had no hard evidence. Maybe the connection is through Adam as he seems to be in that trade in all references to him.
I haven't found any information on the mill myself but I know the industry was huge at that time, probably just one of many.
Thank you for taking such an interest in my family.
Sally