Yes!! I would love it if they went out on a limb and chose something entirely new (I don't think they will but I would cheer if they did) and with a great meaning.
Girls:
Antonia (priceless one)
Helena (bright, shining one)
Meredith (great ruler)
Honora (woman of honor)
Ada (noble)
Seraphina (light)
Boys:
Augustus (great, magnificent)
Ethan (strong, firm)
Frederick (peaceful ruler)
Aaron (exalted, uplifted)
Simon (listener)
Theodore (gift from God)
I'm sure you traditionalists will freak out at this- it's just meant as a light hearted lift to the same names repeated over and over in this thread.
Seraphina and Honora sound like celebrity baby names not royal (actually Ben Affleck and Jessica Alba would agree). Ethan is so over used, every kindergarten likely has 2 if not more in their class now.
Many of the names you have listed, have actually been suggested on here. They aren't new, and do have a royal history to them.
Frederick: The name seems to have started with the Hannoverians. Frederick, Elector the Palatinate, was grandfather of George I, first Hannoverian king. George's mother Sophia was his daughter with Elizabeth, daughter of James VI and I of England and Scotland. From him, we have:
Frederick, Prince of Wales: son of George II, father of George III
Prince Frederick- son of the above, died at age 15
Prince Frederick, Duke of York- second son of George III
Augustus Frederick- another son of George III
Lord Frederick Windsor- son of Prince Michael of Kent
Others like George V and two of his sons, had it as a middle name.
Augustus:Like Frederick, Hannoverian origins. George I's father was Ernest Augustus Duke of Brunswick-Lunenberg. It was a popular second name, the Hanoverians often having a double first name.
Ernest Augustus: George I's brother, but made Duke of York by his brother
William Augustus, Duke of Cumberland: son of George II
Edward Augustus, Duke of York and Albanny: younger brother of George III
Ernest Augustus of Hannover- son of George III
Augustus Frederick, Duke of Sussex- son of George III
The most recent use seems Lord Nicholas' son Leopold has it as a middle name.
The female Augusta has been used as well on a few occasions.
Simon has a bit of a royal history. Simon de Momford was Earl of Leicester. He married Eleanor of England, daughter of King John. He led the barons rebelion against his brother in law Henry III, and for a time, ran the first elected parliament in Europe. He was later killed in battle. His daughter Eleanor is considered the first woman to be known as Princess of Wales, by her marriage Llywelan. Not a great royal history for that name.
Theo,a short of Theodore, is a middle name of James, Edward's son.
Helena: form of both Helen and Eleanor, a name very common
Eleanor of Aquitane: wife of Henry II
Eleanor, Queen of Castille: daughter of Henry II
Eleanor of Brittany: daughter of Geoffrey, son of Henry II, imprisoned due to her claim being stronger then that of Uncle, King John or cousin Henry III
Eleanor of Provence: wife of Henry III
Eleanor of England: daughter of Henry II
eleanor, princess of wales: her daughter
Eleanor of Castille: wife of Edward I
Eleanor, Countess of Bar: daughter of Edward I
Eleanor of Woodstock: daughter of Edward II
Eleanor Brandon: granddaughter of Henry VII by Mary and Charles Brandon
Helena: daughter of queen victoria
Lady Helen Taylor: the daughter of the current Duke of Kent
again a name that has been used as a middle name as well.