The pair are travelling around the country in a campervan for "three weeks but possibly longer if Ireland do really well".
Mr O'Connor said he was surprised at the support for his countrymen in New Zealand but believed their popularity here was because of similarities between the two nations.
"It's all about the craic, which is about having a laugh and a good time no matter what," he said. "It helps that people here are similar to the Irish, they're very friendly, enjoy a beer and don't like the English either."
Also there with his daughter Elaine and son Conor was Greg Gyde, another "Irish" supporter from Morrinsville in the Waikato.
Mr Gyde claimed his Irish ancestry through his wife, who could not be at last night's game because she lost her voice screaming during last week's win over the Australians.
"They [the Irish] are a fantastic crowd," he said. "They have the right attitude. Win, lose or draw they're just out there to have a good time and make some new friends, which is why we're here."
Hopeful but realistic about the outcome were Russian Bears supporters Andrey Sukhovey, his younger brother Oleg Sukhovey and their friend Kirill Pokidov. Not one of the trio could name a single player in the Russian team but they all said "the short guy" was "really fast".
Asked how their team would fare against the Irish they were all in no doubt.
"Oh, we are definitely not going to win," said Mr Sukhovey.
Originally from Vladivostok but now living in Auckland where he works in the finance industry, Mr Sukhovey said rugby was still finding its way as a sport in Russia. "But people like it because it's a tough physical sport ... . it builds character."
Another Russian, Mikhail Rogachev, a 43-year-old computer programmer from Moscow but also living in Auckland, said he had big plans if his countrymen won.
"If we win I am absolutely getting completely drunk ... maybe I [will] get drunk anyway," he said.
Mr Rogachev believed his nation would one day be a powerhouse of the game. "Now is [the] first time at World Cup ... not now but maybe in [the] future, we will be strong."
Ireland beat Russia 62-12.