When we first meet Angua's parents and brother in the book, the Baroness first refers to her husband as "Guye" as in:
[page 47 US paperback]"Guye! You know what I said! It's after six! Change when you come in from the garden!"
But later, on the same page she calls him "Ruston" as in:
[page 47]"Ruston, I've told you about this a thousand times!"
On the next page she calls him "Ruston" again.
According to the Discworld Companion, his name is 'Guye' - where did the Ruston name come from and is it in the UK version?