This comes from behind the name message boards where someone made this post "the surname in question is Vernetti (or Vernatti). We know very little about the origins, other than we are Italian and the name was changed to Fernatt once my grandfather entered the Army. Does anyone have any ideas about the meaning/origin? Thanks!"
It seems very interesting to me that somehow the surname Vernatti could end being Fernet (the post doesn't say so but if it could end as Fernatt it could end as Fernet) and Vernatti could be a dutch-italian name (Van der Natti-->Vernatti) but this is just an unproven hypothesis... anyone knows better?