In case your quilt is ever found in an antique shop 100 years from now, you'll want the buyer to know as much as possible about you so:
Put the name of the quilt
Who it was made for (if you know)
The date you finished the quilt (not the day you started)
The city and state where you reside -- and
Your full name INCLUDING your maiden name, I've been told that the maiden name gives a better identification than simply your married name.

Also -- it's best to apply the label before quilting as the quilting will help keep the label on the quilt (in case some thief attempts to remove the label).