How do Wikipedia articles get named? Often very easily, but sometimes it's much more tricky. Here are the most important considerations.
In most cases, the title is derived from the obvious proper noun: Pyramid of the Sun, or Neal Stephenson. Some articles describe abstract topics, like Longest recorded sniper kills, requiring some creative judiciousness. Titles should be recognizable, precise, and always neutral.
The three examples above also show how article titles are always written in sentence case: only proper nouns and the first word are capitalized.
Often, there are many topics which share a name, and in these cases Wikipedia must practice the tricky art of disambiguation—a fascinating topic we'll pick up next week.