I found that similiar beads like these and some of my other beads like these being sold by Firemountain and other sellers were called drawbench beads. I think it may be because of the swirls of added color like strips that are on them . these have gray color as you can see in the photo, others have black, they are not stripes but what I call swirls
other than that I have no idea where the name comes from, sorry I can't be of more help