Franc 1 Swiss franc 1983 1 French franc 1991 1 Belgian franc 1996 1 Luxembourg franc 1990 1 Monegasque franc 1978 5 Comorian francs 1992 The franc is the name of several currency units, most notably the French franc, the currency of France until it adopted the euro in 1999 (by law, 2002 de facto); and the Swiss franc, still a major world currency today due to the prominence of Swiss financial institutions. The name is said to derive from the Latin i… (More on Franc)