it is always a good idea to label your quilt with at least the name of the quilt- your name, city, state, date finished- fiber content and care instructions- other personalizations are nice when it is a gift- special quilt for a special purpose.
you can print your labels onto fabrics- draw with fabric pens/paints/markers, buy ready made ones and iron on ones- there are lots of options and you are only limited by your own imagination or lack of-
you never know where a quilt might wind up- it is always nice for whom ever comes across it to be able to see who made it- where it was made- what it's made out of and how to take care of it. the same information you would want to find if you were lucky enough to come across one somewhere- some time down the road-40 years from now-...
and if you ever plan to sell any quilts the fiber content and care instructions are very important.