PONCA PRIMEAUX

The added 'x' on the Primeau surname is found among the Ponca and then Santee Primeau families. 'Primeau' is a French name, and 'x' on the end of French numbers is pronounced 's', but this doesn't seem to be the case here, ie, 'Primeau' and 'Primeaux' are pronounced the same. it is easy to imagine that the French 'x' was added to distinguish between the Primeau brothers' families (Pierre Primeau and Primeau), or simply adding on their most common form of signature like Pierre's in the 1825 treaty - "his x mark".

source: www.primeau.org/poncaprimeau.html

used with permission of author.