Looking for William Boyd Married IN Wollongong 1842

Hi,
The only documentation I have on my great great grandfather, William Boyd, is that he married Ellen English in St Xavier's Roman Catholic church in Wollongong in January 1842 and was the father of the child they had in November 1842. There is a family story that he was a master mariner.
I find him very hard to research because of the commonality of the name.
I would be grateful for any suggestions on how I can find out more about him.
Regards,
gogilvie