A UK mother was left “absolutely devastated” after her daughter’s passport application was denied because she was named after a popular “Game of Thrones” character.
Worth mentioning that the UK and Ireland is the easiest country to change your name in. All you need is two friends and a printer. Although it may be more complicated for children, especially if the parents aren't together (I still think it's pretty straightforward if they are together, just both parents need to approve it as well)
Realistically you also need 35 quid to have your drivers license re-issued which you can then use as an initial form of ID to get everything else changed.