Weel Abby, I think yer jist 'on the money' there!

Child explained that the 'z' in gaberlunzie was silent as it was representing a redundant letter in the ancient Scots alphabet which wasn't pronounced (go figger!). You can see other examples of this in present day Scots placenames and family names (Menzies for instance - think of the US jazz bassist Charlie Mingus - that's how it's pronounced!).

Jack