New Zealand's most popular baby names for 2018.

Your baby will never be Royal. It is against the law. That kind of name is banned, under the Births, Deaths, Marriages and Relationships Act.

The Registrar-General has ruled Royal and 43 other names could not be used in 2018.

While the most popular names of 2018 were Oliver, Charlotte, Mia and Nikau, the most popular but disallowed names were Royal and King.

The Registrar-General was responsible for reviewing potentially inappropriate or illegal names. In 2018, they declined 66 names.

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A spokeswoman for the Registrar-General said names could be declined if they were deemed offensive or resembled a rank or title which the baby did not hold.

"Of the nearly 60,000 babies born in New Zealand each year, less than 1 per cent of babies have their name personally considered by the Registrar-General," the spokeswoman said.

Names which had been blocked last year included military titles, roman numerals and religious names.

GETTY The Department of Internal Affairs has rejected 66 names in the past year.

The Registrar-General declined Allah, Messiah and Saint.

Names and titles relating to the monarchy were commonly declined.

Avaya-Royal, Princess-Dixie-Rose, Kingdavid and Royale-Bubz were all declined as names in 2018.

A large number of royal-esque names with alternative spellings featured in the list.

Emprah, Heaven-Princezz-Star, Royelle, Royality, Rhoyal-Kahurangi and Majestee-Honours were among many names declined which related to the royal family.

The Department of Internal Affairs, which managed births, deaths and marriages, said families had the chance to argue their case for names which came under review.

The Registrar-General was given the power to reject named in 1995, if they were offensive or an unreasonable length. More recently, it had also started to reject names which appeared to be urls.

In 2016, the department revealed some parents had tried to give their children urls as names. Consequently, the Registrar-General was rejecting names which contained slashes, numbers or dots.

Among the list of names rejected since 1995 were "4real", "Anal" and children who had been given numbers or roman numerals as names.

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