PIE *peku (livestock, movable wealth) became Germanic fehu (Old English feoh, cattle and money), Latin pecus (cattle) and pecunia (money). Old English feoh became fee; feudal law reused it for land held in service, the fief. Pecuniary, peculiar (originally private property in cattle), and impecunious all moo quietly in the same pasture.
The anthropology everyone's heard: cattle were humanity's first bank account, self-reproducing interest included. The rune Fehu, first of the runic alphabet, is literally named wealth-cattle, the alphabet opening with money.
The strangest branch: peculium, the private property a Roman slave or son was permitted, from pecus. Peculiar thus once meant privately owned, then particular, then odd. The word for weird began as the word for yours.
When did wealth stop mooing, and did anyone notice the silence?