Hi I found a Pierre Carmonche.
1880 Census 3rd Ward, Ascension, Louisiana
Son: Pierre Carmonche, age 20, born 1860, Louisiana
Mother and father also born LA. Race: Mul, job: laborer.
Mother Adele Carmonche, age 50, born Louisiana and
parents born in LA too.
daughters: Elizabeth age 15, and Aby age 13
bothe born in LA
Hope this helps, Jim