GrandjeanFrench, French (Swiss) Derived from French grand meaning "tall, large" and the given name Jean 1, hence possibly a nickname for a tall or large person.
GriselFrench, French (Swiss) Derived from the Old French adjective grisel, a variant of gris meaning "grey". It was a nickname for a person with grey hair a grey complexion or who habitually wore grey.
MorandFrench, French (Swiss) from the medieval Latin personal name Maurandus Morandus derived from Maurus "Mauritanian Moor" and the suffix -andus (following the pattern of names formed from a verbal noun such as Amandus) or shortened from Moderandus which appears to be Latin for "he who is (able) to be guided"... [more]
PiagetFrench (Swiss) Of uncertain origin and meaning. This name was borne by Jean Piaget (1896-1980), a Swiss child psychologist noted for his studies of intellectual and cognitive development in children.
SeydouxFrench, French (Swiss), Occitan Derived from the Germanic names Sedulius, Sedulfus or Segedolfus. Another theory suggests Occitan roots; it might be an occupational name for someone who worked with silk, derived from Occitan sedós meaning "silky, soft"... [more]