Category:Projects by player name
When creating a category page for this, be sure to add a sortkey. That means that the wiki knows to sort by player name instead of putting everything under M for "Made by [Playername]".
So on the category page for Category:Made by Jazzable, typing the category like this would work: [[Category:Projects by Player Name|Jazzable, Made by]]. For more details, take a look at a brief tutorial on Wikipedia about how to sortkey.