One of the most popular posts on my personal blog explains how to insert your maiden name (or other alternate name) into your profile. In fact I get a lot of people who run a search from within Facebook itself. Since it seems to be something people want to know, I thought I’d repeat the information here.
They added this option relatively recently so not many seem to know it’s there. If you choose, your name will appear in parentheses in your profile, and searches for it will find you, but it won’t be a part of your name (as it would if you use the middle name field instead.)
Of course, if you don’t want your old high school ex to find you, better to just leave it blank .