Yes, I came across the same problem, but though it was due to a transcription error. If you also read the same, I can not explain it for now. Most of this research was done in the 1980’s.

The marriage record in the Mass. Vital records reads as this; ( my extract )
Diette,Arthur 19 pullman Ill. ( Adolphus & DinaThomas ) LOWELL 20 Jan. 1905
Berard,Lumina 17 lowell ( Francois & Marie L. Pepin) R. C. 555/508
Other records record them as Dolphus & Silena, which are more French, but I believe they are the same couple.

I looked at the 1880 census again last night and found what I believe is the family recorded as GNYOT.
This is what I found on Ancestry.com;
Name: Louis Gnyot Home in 1880: Lowell, Middlesex, Massachusetts Age: 19
Estimated birth year: abt 1861 Birthplace: Canada
Relation to head-of-household: Brother Father's birthplace: Canada Mother's birthplace: Canada
Occupation: Cotton Mill Marital Status: Single Race: White Gender: Male Cannot read/write:

Household Members: Name Age
Adolph Gnyot 26 b. N.Y., a married lab.
Jeannot Gnyot 25 keeps house b.Can.
Adolph Gnyot 5 b.Canada 1875
Louis Gnyot 2
Frank Banbore 22
Aremedeo Gnyot 22 bro. bakers appentice single
Joseph Gnyot 33 bro. married in cotton mill 1847
Delia Gnyot 30 sister in law, works in mill
Source Citation: Year: 1880; Census Place: Lowell, Middlesex, Massachusetts; Roll: T9_544; Family History Film: 1254544; Page: 181.3000; Enumeration District: 454; Image: 0653.

This seems to match with the information I have for the Louis Guillet / Edesse Choiniere family. Joseph was b.1846 in Marieville, Aremedeo ( Hormisdas in French ) was born in 1858 in St.Urbain, Que. along with Louis in 1861. Joseph in 1877 is described as a son of Louis & Edesse and Louis in 1881 as a son of Louis and Andois.
Regards