The FAQ says:
Interested users are asked to digitally "sign" the proposal with their full name to help assure that site will have an active community in those critical early days. While your full name is never shown, you may add an optional comment which is displayed alongside your username in the list of committers. To ensure that commitment is taken seriously, you may only commit to three sites at any one time.
In which way does using my real name assure there will be an active community?
As far as I can say, what reported as real name is not even checked. I could enter kiamlaluno as real name, and I would not get any error message, saying (for example) that I am expected to enter at least two words. That what actually done in my commitments, as I thought what asked as real name was going to be used to create the user account when the proposal reached the private beta phase.