Apparently "Pendleton Hill" is either "Hill Hill Town Hill" or "Hill Hill Hill Hill" depending on what the root of the -ton was.
That's a neat factoid but ignores why it's called that: it was originally part of the Rancho La Brea (which was named that for obvious reasons) land grant by the Spanish, and there are oil seeps in other areas of the LA basin. So if you want to refer to that (huge) one specifically, you more or less have to call it that.
What is the ball actually called though! Do they call it just Rihla in Arabic, and use Al when needed, or always refer to it as Al Rihla.
The al is often dropped in casual Arabic. e.g. a restaurant called "Al Shami", will mostly just be called "Shami"