Pat and Sheena Wheaton said they decided to name their new baby "4real" shortly after having an ultrasound and being struck by the reality of his impending arrival.

"For most of us, when we try to figure out what our names mean, we have to look it up in a babies book and ... there's no direct link between the meaning and the name," Pat Wheaton told TV One on Wednesday. "With this name, everyone knows what it means."

But when the parents filed the name with New Zealand's Registry of Births, Deaths and Marriages, they were told names beginning with a number were against the rules.

The government office has opened negotiations with the parents about the name under a policy that says all unusual names must be given case-by-case consideration.