Have found the death of David Vincent Byrne and I see his mother was Mary Barry. That would probably explain were the BARRY surname came from.Mary Barry's father was David Barry.
Name: David Vincent Bryne Death Place: Wangaratta, Vic Age: 85 Father's Name: Jas Bryne Mother's Name: Mary Barry Registration Year: 1947 Registration Place: Victoria Registration number: 23456
James Byrne married Mary Barry on the 17 Jun 1862 at Port Ferry, Vic.John or David Vincent Barry/Byrne was born about 1861-1862, before his mothers marriage. He may have been raised by the exended Barry family.
I have found 6 children born to this couple and one was named John Charles Byrne b.1873, so when John Vincent Barry and his family returned home when his father died in 1909, he must have changed his name then.