Adding the following code will change how the name is sorted in category pages, and you can replace the name using the same format for any other names as well. It's also useful for titles that start with words like "The".
On the page to be sorted, so in this case, MJ Delfino. I like to put this at the bottom of the article with the categories so it's out of the way from the main body of the page and easy to find. Some wikis also place them at the top.