Prosper m
French and English: from the Latin name Prosperus, derived from the adjective prosper fortunate, prosperous (originally ‘according to one's wishes’, Latin pro spe). This was the name of various early saints, including a 5th-century theologian and contemporaneous bishops of Orléans and Reggio. It was a favourite among the English Puritans, partly because of its association with the English vocabulary word prosper, but is now rare. In France it is best known as the given name of the writer Prosper Mérimée (1803–70).
First names dictionary. 2012.