I find that naming a quilt is very similar to deciding how it will be quilted. During the creation process (be it designing, fabric selection, cutting, sewing, unsewing, quilting, etc.) sometimes the quilt will speak to me and tell me what it wants to be called. Sometimes they do have temporary "working" names that change into the real names as I come closer to the completion. And yes, some quilts are just named by the pattern/block used.
Msjane, maybe your "purple flower" quilt is awaiting you to give it a name of a purple flower, like Lilac or Clematis or Alium, etc.