It is tradition for those who are in line to the throne to be given several names, former royal butler and etiquette expert Grant Harrold previously told Insider.
Three names are typical for those in line for the throne, so that they have another name to choose from if they were to become King or Queen," Harrold said. "Everyone thinks that when Prince Charles becomes king, he will automatically be King Charles. But this may not be the case. Instead, he could choose to become King George VIII, as George is in his name. This happened with King George VI, whose previous title was Prince Albert."
The most recent examples of this are the Duke and Duchess of Sussex's son Archie Harrison Mountbatten-Windsor, born in 2019, and the Duke and Duchess of Cambridge's youngest child, Prince Louis Arthur Charles of Cambridge, born in 2018.
Eugenie and Brooksbank's child will be 11th in the line of succession. So while it's unlikely the child will ever ascend the throne, it's still possible the couple could choose several names to pay tribute to other members of the family.
The Cambridges honored Queen Elizabeth II and Princess Diana by giving Princess Charlotte the middle names Elizabeth and Diana, while Prince Louis' middle name honors his grandfather Prince Charles.