They got their names by the combination of jig style and what they used to dye the bone.
I talked with Bill Horn this morning and found out how the last 2 knives got their names. The dyed bone was done by a company in the Carolina's and they are proud of their work, I'm just sorry I don't remember which state. I'd be proud of that also, I like the look!
The sheffield tobacco was bone dyed in tobacco juice, that brings a spitoon in mind

but that has nothing to do with it.

They made a dye with tobacco leaves and distilled water. They dyed the bone in the tobacco leaf dye that they made. The Rogers Bone green tea used green tea leaves and came out a light color and you can see the natural bone in some places. This dye of green tea leaves was made by the same company. I thought that was pretty cool.
