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Thanks Blues! Any idea where the term came from?
The first I ever encountered the term was in Great Expectations, by Charles Dickens. The ex-convict. Able Magwich carried one. So the term was in use by Dickens time.
Bernard Levine (and his forum) would be the best resource for that answer imho.
I've heard a couple of answers and prefer not to inadvertently mislead.
Having a curved shape means that there's often a reasonable amount of blade to get hold of as in pinch opening. These knives tend to be larger I'd say. Oddly enough, clasp means in jewellrey, a device to fasten things together. I wonder if Clasp knives originally had some kind of catch to keep the blade open? A primitive lock sort of thing?