The only concrete I came across: Social Security Death Index: Burton Delotes b. 3 Jul 1953 d. Apr 1983 Sikeston, SCOTT, MO card issued: MO
I did a quick search using google.com:
Heraldic Families - France
QUENTIN, Nicolassieur deLadous - 16 Aug 1699
Sales, (de)Jean-Baptiste, sieur de Ladous (place name) and another Sales,...de Ladous (place name)
Also de Ladous is name connected with the French Revolution.
Delotes, Simon and fmily 1880 US Census Randolph Co, IN Village of New Pittsburgh, Jackson Township
1870 US Census: Susquehanna Co, PA John R. Wilsey b. 1829 PA + Sarah K. Luther child:"Delotes"10/12 mo.
Death Records: Delotes Aileen PRICE (surname) MO Death Records: 1910-1956 d. 9/2/1925 Randolph Co father Arthur Price b. IOWA
1880 - LDS/Family Search:
Delotes Haddon - b. NY
CURRENT: CORRINE LA DOUS - Cal Tech Eleanore Allice LA DOUS - Lyon France - Health & Allied Services Virginie LA DOUS - face book entry Herve LA DOUS - French Ambassador to China Regis LaDous- author Charlotte Marie de LaDous - says could have been LADOUCETTE
If you pronounce the C as S - LaDousette - short: LaDous
There is a street: de Ladous in Bordeux, France
Knowing that Census takers spelled things they way they heard them and not always the correct spelling - well, have fun!