A street sign in Cambridge, where I grew up, has been subject to a bit of guerrilla editing by somebody who cares furiously about apostrophes. I almost suspect my mum.
Scholars’ Walk I see the sense of (unless only one scholar is supposed to walk there), but what’s wrong with Pepys Court? Cambridge also has a Coleridge Road, a Cowper Road, a Jesus Lane, a Hobson Street, a St Barnabas Road, a Sedgwick Street, a Cavendish Road and many more named after people but with no possessive.
The apostrophe added to “Pepys” is completely unnecessary, the act of someone trying to be clever but who isn’t clever enough to think it through.
Which means, I’m relieved to say, that it couldn’t have been my mum.