I found Alfred Ardeneaux on the 1920 Iberville Parish census in ward 8. His surname was picked up by Heritage Quest as "Ardeneus". The census is very blurred. On the Mormon site, www.fsbeta.familysearch.org
, that same census has the spelling as "Ardeneaux".
1920 ward 8 Iberville Parish
Alfred Ardeneaux 1889 bn LA
Annie 1895 bn LA
Bertha 1913 bn LA
Mabel 1916 bn LA
John Curtis 1919 bn LA
I found Annie on the Social Security Death Index. She was born 9/3/1895 and died 9/1983.
I found an 1860 census for Houma in Terrebonne Parish.
Etienne Ardeneau 64 bn France
Mary 58 bn LA
Sylvanie [male] 26 bn LA
Malvina 18 bn LA [Sylvanie's wife Malvina Leblanc]
Eugene 23 bn LA
Alfred 20 bn LA
Mary Louise 21 bn LA
It is likely that Alfred [bn 1889] was the son of Sylvanie, Eugene or Alfred.
Sylvanie and Malvina had at least two children:
 Sylvania bn ca 1882, died 2/25/1947 and married John May on 6/24/1909. This info from her death record.
 Sidney Pierre bn ca 1886 at Chacahoula, died 12/22/1952 at Franklin, St. Mary Parish and married to Lydia Nolin. This info from his death record.
Eugene Ardeneaux and Leonie Migues had at least one child:
 Odee bn ca 1880 Iberia Parish, died 8/27/1927 Iberia Parish. This info from her death record.
I used various spellings and didn't find any more census records for this family. I'll keep looking.
If Alfred [bn 1889] descends from Etienne Ardeneau, then his surname was probably originally spelled, "Ardeneau". The "x" would have been added in Cajun Louisiana.
Hope this info helps in your research.