In French, 'huguenot' was the name for protestants. There is no old French coin known as a 'huguenot' - but there is a 1924 US half-dollar called 'Hugenot-Walloon tercentenary'. (follow link)
the Sou (alternate spelling 'sol') was an old French coin.
FRANC
A franc
Old French coins would be called Francs. now the currency of money there is called Eros, but very old French coins were called Francs. Singular is Franc. Plural is Francs.
"monnaie ancienne"
It is an old French coin, from the 1940 to 1944 era.
ecu
sou, ecu
écu
The old French coin starting with the letter "E" is called the Écu. It was a silver coin used in France from the 13th to the 18th century.
Livre
An old 6d coin (half a shilling) was called a tanner