(OT, but it looks like the page's character encoding is broken. And of course Firefox decided to ditch the ability to set the correct charset manually. The "Repair Text Encoding" button isn't working for me.)
I would also add that the chapter "Of Beleriand and its Realms" is OK to skip if it's not your thing, especially on a first read. It's mostly just describing what's on the map (of course it's still well written in Tolkien's prose). There are plenty of people that enjoy it, and there are plenty that don't.
And are there any examples of mistakes in LOTR where he messes up the chronology or anything like that?
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Never really been interested in LotR lore, but I've read them multiple times and seen the movies many more times. Never seemed worth the times and sounded like dry work compared to the novels, but yeah this is pretty cool!
https://web.archive.org/web/20120911120029/http://wired.com/...
The out of universe answer is probably that Tolkien probably very much enjoyed making up these names, as an exercise in playing with and building his languages and world. He likely would have only fallen back to numbers either when truly and deeply stumped (I don't think this really would have happened often), or to signal something.
I also believe you can also see some of the Old English influence on Tolkien here. If you look at the Anglo-Saxon Kings, you see relatively little re-use of names. Instead (going off the top) you get Egbert, Ethelwulf, Ethelbald, Ethelbert.
Basically bad Maiar.
https://en.wikipedia.org/wiki/Duck_family_(Disney)#Family_tr... (though I prefer the illustrated version by Don Rosa)
I wonder if any book has actual, believable endogamy due to geographical constraints?