Buck
This Americanism is one of the most popular nicknames for money. The buck is thought to derive from buckskin, though buck can refer to a male deer, antelope, rabbit, hare, sheep, or goat. In the 1850s, the skin of deer was used by Native Americans and frontiersmen as a unit of exchange in transactions with merchants. We’ve come a long way from having to skin an animal to pay our bills, but in the vernacular the buck prances on.