Actually there are quite a few royal names that we could have had and didn't.
Ethelwold had Alfred the Great not left a son.
Theobald if he chose to supplant his younger brother Stephen.
Eustace if Stephen's family had retained the throne.
Matilda had the war with Stephen gone differently.
Geoffrey had he outlived his brother Richard 1.
Arthur ditto (or had John died before Richard 1).
Louis had John died childless
Alfonso (!!) had he not died at 11yo in 1284.
Lionel had he outlived his father, elder brother and Nephew, and seized power in 1399.
Roger (Mortimer) had he not been killed in Ireland, and one on to succeed Richard II.
Thomas had Henry V died a couple of years earlier.
Humphrey had Henry VI died before 1447.
Margaret had Henry VIII died before 1516.
Catherine had Elizabeth 1 died in 1562.
Philip had the Spanish Armada succeeded.
Isabella possibly ditto
Arabella (Stuart) had James VI of Scotland died before Henry's birth in 1594.
Ferdinando (Stanley) a possible had James and Elizabeth I both died earlier.
Frederick had he outlived his father George II.
Charlotte had she survived the childbirth in 1817
Leopold had Charlotte lived and gone on to have a son named for his father.
Ernest had Victoria died before the birth of her daughter
Augustus had this happened and Ernest been rejected in favour of the next brother.
Adolphus had this happened and Augustus died w/o legitimate heirs.
Alexandrina had Victoria. used her first name.
Albert had either Edward VII or George VI used their first names.
David had Edward VIII reigned under the name by which the family usually called him.
Andrew (Oh dear!) had the future Charles III died before fathering Prince William.
Please feel free to suggest any that I have missed.
Ethelwold had Alfred the Great not left a son.
Theobald if he chose to supplant his younger brother Stephen.
Eustace if Stephen's family had retained the throne.
Matilda had the war with Stephen gone differently.
Geoffrey had he outlived his brother Richard 1.
Arthur ditto (or had John died before Richard 1).
Louis had John died childless
Alfonso (!!) had he not died at 11yo in 1284.
Lionel had he outlived his father, elder brother and Nephew, and seized power in 1399.
Roger (Mortimer) had he not been killed in Ireland, and one on to succeed Richard II.
Thomas had Henry V died a couple of years earlier.
Humphrey had Henry VI died before 1447.
Margaret had Henry VIII died before 1516.
Catherine had Elizabeth 1 died in 1562.
Philip had the Spanish Armada succeeded.
Isabella possibly ditto
Arabella (Stuart) had James VI of Scotland died before Henry's birth in 1594.
Ferdinando (Stanley) a possible had James and Elizabeth I both died earlier.
Frederick had he outlived his father George II.
Charlotte had she survived the childbirth in 1817
Leopold had Charlotte lived and gone on to have a son named for his father.
Ernest had Victoria died before the birth of her daughter
Augustus had this happened and Ernest been rejected in favour of the next brother.
Adolphus had this happened and Augustus died w/o legitimate heirs.
Alexandrina had Victoria. used her first name.
Albert had either Edward VII or George VI used their first names.
David had Edward VIII reigned under the name by which the family usually called him.
Andrew (Oh dear!) had the future Charles III died before fathering Prince William.
Please feel free to suggest any that I have missed.
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