When : Always April 9th
Name Yourself Day is your chance to give yourself whatever name you'd like...for a day. If you like your name, then change your name for just today. If you don't like your name, use today to select a new name for life!
Participating in Name Yourself Day is simple and easy. Go ahead, give it a try. Change your first, or middle, or last name. Or, change them all. Give yourself a cool and catchy nickname. Once you've selected your name, you've gotta communicate it to all of your family and friends. This could prove to be the hard part. It will likely take time for your new name to catch on.
Note: Name Yourself Day is not the same as Middle Name Pride Day.
All details taken directly from provider content at http://holidayinsights.com/moreholidays/April/nameyourselfday.htm