I label all my quilts. At first I used a 'permanent marker', even the sharpie and pigma pens, but over time with laundering they become too light or wash out. So now I use the font on my sewing machine and stitch my labels onto a piece of lighter fabric and fuse it to the backing, then quilt over it when quilting the quilt. It aint gonna come off.
When I first learned to quilt I was told it was important to put labels on all quilts, even for grandkids etc, cuz they could be of historical (don't laugh) interest or when someone in the future is doing family genealogy. We don't think our quilts will last that long, but do we really know? Imagine 100 years from now, someone opens an old trunk and finds your quilt! If no label, no 'history'.
People find quilts at thrift shops, estate sales, family trunks etc all the time and wonder, ... who, when, where?
Yes, put labels on your quilts!
warm quilt hugs, sue in CA