Prince Harry used his HRH title on the birth certificate of his daughter, Lilibet Diana. Meghan Markle, alternatively, dropped hers and used her birth name.

In the document obtained by People, it saw the difference between Lilibet and Archie Harrison's birth certificates. Lilibet was born June 4 at 11:40 a.m. in the Santa Barbara Cottage Hospital near the Sussexes' Montecito home.

Harry listed his first name as the Duke of Sussex. On the other hand, his wife simply listed her full name, Rachel Meghan Markle, as it required the mother's legal and maiden name.

In Archie's birth certificate, which the public saw 11 days after his birth May 6, 2019, Harry listed his name as His Royal Highness Henry Charles Albert David Duke of Sussex. Markle wrote her name as Rachel Meghan Her Royal Highness The Duchess of Sussex, MSN noted.

As the birth certificates in the U.K. required the parents' occupations, the couple listed theirs as the Prince and Princess of the United Kingdom. Markle does not have a princess title.

Meanwhile, the California birth certificate did not have the parents' occupations section.

Harry and Markle have stopped using their HRH titles after stepping down from being working members of the royal family. This means they will stop doing any royal duties, like what Prince William, Kate Middleton and other senior royals do.

Although they are still a duke and a duchess, they simply call themselves Harry and Meghan. Also, the HRH title is a legal part of Harry's name, so it is required that he puts it in Lilibet's certificate.

"It's his legal name - the document required his legal name," a representative told Insider.

According to Fox News, Harry is still a prince being a direct grandson of Queen Elizabeth II. Despite his move to the U.S., the royal family does not renounce him or even strip off his title. He just agrees not to use it.

He will also be continuously known as the Duke of Sussex, while Markle will remain the Duchess of Sussex.

In addition, the difference between their names in Archie and Lilibet's birth certificates-using their royal titles-is because they were still working as full-time senior royals at the time when they gave birth to their first child.

Anyhow, Archie and Lili will automatically have the prince and princess titles when Prince Charles becomes the new king - being direct grandchildren of a monarch.