There was someone with the surname Jism (Jisum/Jisam?) on the radio yesterday. I’m hoping for their sake that I misheard it.
Sorry to be the bearer or boring news, but it was most probably Chisholm - as in Mel C from the Spice Girls.
There is a school in Somerset called “Sexey’s”.
There's a university in Lincoln called 'Bishop Grosseteste'. As if having a surname that sounds like it's the Latin for 'big balls', there's also a 'bishop' right next to it 
Also, there's singer Ron Sexsmith. Sounds like he should have swapped names with Ron Jeremy.
The headmaster of a local primary school was called Mr Willey, which was almost unbearably amusing to all the 6-year-old boys he had to teach.
Whereas, in stark contrast, I am in my 40s, so when I read that and imagined him introducing himself to the class....
A grad seconded from China had the family name Pong. She chose herself an anglicised first name, which was quite common for grads. Fanny. She chose Fanny.
Fanny Pong.
I read an article a few years ago about an enterprising teenage girl who set up a website dedicated to helping Chinese people who wanted an alternative English name for international use. I think she charged about a fiver a time. Apparently, it's quite common for people to (unknowingly) just pick any old English word, so they could end up called something like 'Table' or 'Postcard'. I suppose they could just have looked for a specific baby name website, but even then they could end up unwittingly choosing Adolf, Avishag or Gaylord or whatever. Much simpler to just pay a few quid to a native speaker to ensure you get a distinctive but non-hilarious one!
There's a man in south Wales with the magnificent name of Ramjam Delilah Funkyboogaloo-Smythe!