Cosmo is the precious only child of very busy parents in their 40s. He's having a very expensive private education. Ma is a successful journalist and Pa is a TV producer. Cosmo will dabble in (aka fail at) various creative endeavours before fulfilling his destiny as restaurant critic for The Guardian.
Edmund is the eldest son of the local vicar and has 5 siblings who all look insipid and pale like their mother. Edmund is rugged and loud like his father and spends his weekends playing rugby. Edmund's ambition is to become the Archbishop of Canterbury but an unfortunate incident involving Class A drugs, a hunky fireman and a couple of stolen goats will scupper that.
Hector is a tall, tough lad whose parents wanted 'posh' names for their children. His sister Hermione is built like a scaffolder and between them they cover the full lexicon of British swear words multiple times a day as they drive around selling burgers from their van.
Conrad will just become an arrogant, insufferable pillock whatever he does.
Magnus writes poetry all day in his attic bedroom, which worries his parents as he's 42 and should have left home by now.
Lysander hates his name because everyone at school calls him Liz. When he enrols at Cornwall College, Newquay to spend all day surfing study marine biology he'll reinvent himself as Xander.
Rafe will be OK as long as he looks like Henry Cavill but the chances are he'll inherit the limp hair, pasty faced, gawky looks of his parents. Far better to just call him Nigel after his father.
Ranulph the red-nosed reindeer...
Peregrine will despise his name because it's ridiculously pompous and the first chance he gets, he'll dispatch his parents in a shooting 'accident'. He'll then change his name to Gary and become a plumber in Hull.
Benedict & Leonidas are pointless names because these boys will just tell everyone their names are Ben and Leo. Ben will become a travel writer and Leo will be his companion photographer.