Yes, a good read back of this thread will likely show up several pieces of duplicated info, some of which is very likely to be factoidal, rather than actual validated fact.
At the familysearch.org website there's quite a few transcriptions in their Historical Records section that may be relevant. These are for the Roman Catholic baptisms of children of Patrick and Catherine FIRTH. These children were baptised at St Francis Xavier, Narrabri or at St Joseph, Gunnedah, depending on the respective child. They match up quite well with the civil registrations on the NSW BDM online index.
I continue to wonder about that earlier remark about 'animal names' and perhaps there is an explanation. You see, as I understand it, quite often back in the 19th Century the Roman Catholic records for baptisms (and for burials and for marriages) were recorded in their registers in the Latin language. And, I am quite sure that very few people living in NSW in the 19th Century were educated sufficiently to be considered excellent Latin speakers and readers. Of course, many people in the middle of the 20th Century used a 'fun' way of speaking and called it 'pig latin'. ...... The Pig being of course an animal. So, I can see that the FIRTH children's baptisms at the familysearch.org website are sometimes transcribed with their latinised names rather than with the English spelling of their given (Christian) names.
Here's the link to the website I am referring to :
https://familysearch.org/searchHere's an example of a transcription on that website for one of Patrick and Catherine's children
https://familysearch.org/pal:/MM9.1.1/XTC5-ZXJ Ernest Gulielimus Jacobus FIRTH, son of Patricius FIRTH and Catherina Winfred McCARNEY
born 06 Oct 1886, baptised 30 October 1886, at St Joseph, at Gunnedah, NSW Australia.
And the civil registration for that birth is indexed as
28836/1886
family surname FIRTH
Child's given name/s ERNEST W J (Gulielimus is likely Latin for William, and Jacobus is likely Latin for Jacob or James)
Father's given name PATRICK
Mother's given name CATHERINE W
registered in the NARRABRI district
Fingers crossed I am not side tracking you too much.
Cheers, JM