While it may be known to some that the Royal Family have a whole host of different titles when referring to their names, some members of the family have totally different first names altogether.
And that's definitely the case for Prince Harry, Duke of Sussex.
The most common modes of address the public hears of the 38-year-old include the go-to Prince Harry, the more formal Duke of Sussex and, of course, just Harry.
However, it may come as a shock to some that Harry is not actually his real name at all.
Commonly a nickname used for Henry, Harry seems to have just caught on and stuck.
The father of two's full official name is just a smidge longer than most people's - even if they have a middle name and a double-barrel surname.
Eighteen words long, to be exact.
Harry's official title stands as: "Prince Henry Charles Albert David, Duke of Sussex, Earl of Dumbarton, Baron Kilkeel, formerly Prince Harry of Wales."
You can see why most people just stick with Prince Harry.
The Duke of Sussex himself seems to be a tad confused as to why people call him Harry over Henry - after all, it is still the same amount of syllables.
Speaking on Entertainment Tonight, the prince revealed: "My name is Henry as well."
He continued: "But everyone calls me Harry. I have no idea why."
The Prince of Wales is delighted to announce the engagement of Prince Harry to Ms. Meghan Markle. pic.twitter.com/zdaHR4mcY6— Clarence House (@ClarenceHouse) November 27, 2017
While the public have been calling him Harry for years, official documents and ceremonies do, however, refer to him as his real name Harry.
When Clarence House announced the wedding of Prince Harry and Meghan Markle, the statement read: "His Royal Highness Prince Henry of Wales and Ms. Meghan Markle Are Engaged to Be Married."
To add even more names to the situation, Harry was also referred to as Captain Harry Wales when he served in the military between September 2012 and January 2013.
The news follows the 'unprecedented' docuseries Harry & Meghan which first hit our screens on Netflix December 8.
The synopsis reads: "In an unprecedented and in-depth documentary series, The Duke and Duchess of Sussex share the other side of their high-profile love story.
"Across six episodes, the series explores the clandestine days of their early courtship and the challenges that led to them feeling forced to step back from their full-time roles in the institution.
"Harry & Meghan is a never-before-seen look at one of the most-discussed couples in history," it concludes.
Harry & Meghan is currently available to watch on Netflix.