Hi,
My grandfather's surname is Nemcean or Nemtzeyan. Full name is Zohrab Nemceyan. He is 100% Armenian. His family comes from Izmit, Turkey. They had to flee in the beginning of the 20th century due to the genocide carried out by the Young Turks over the local armenian population.
My grandpa's family fled to Bulgaria.
I have been also trying to find somebody with this surname but it seems to be rare.
I hope this information helps. Apologies for my English, but I don't speak French.
Regards,
Petya Stoyanova