Oh sorry, I didn't realise you were actually asking.
I did, in fact, know Charles Lynton for Blair.
And I also knew Prince Edward had Richard tucked in there, and I do remember Prince Andrew is Albert Christian Edward because I quite like that combination.
But no, not most of the others - some of them I had to think twice to even know them by the names you used: what on earth made you think of Trinny after all these years?!
Lineker, Barlow, Victoria, Colleen etc aren't really on my radar... From my perspective you've chosen people I wouldn't know much about full stop.
But people on my radar I do know. EM Forster is Edward Morgan, Tolkien was John Ronald Ruel, and Virginia Woolf was in fact named Adeline and used her middle name.
Knowing the names of public figures wasn't really what I meant however - given the likelihood is that OP's dc wont be (as most of us aren't). I DO know the middle names of plenty of my friend's dc, many of my friends and all of my cousins.
I was really thinking of it being used at christenings, birth announcements, weddings and when your parents are very cross (still remember my friend's mum saying crisply: Felicity Jane!") etc - which is surely when it matters more than having random people on MN haul up your name and ask other randoms if they know it?