Belmont (the bit south of Sutton) used to be called California (named after the pub, which I was assumed named after the state). I didn't learn that today though.
I've never heard of a Lambton Worm either. As I'm espousing my ignorance, I don't actually know what Mornington Crescent is either and I've deliberately avoided finding out. Something to do with the radiogram. Yes, yes, I know it's a Tube station.