Mary Elizabeth Denault (born about 1857) has her father listed as "Sam Denault". She ended up marrying Moses Frost.
I can't find a record of her father, nor of her before marriage.
Her father's name of "Sam Denault" comes from the death certificate, but the maiden name of "Dunno" and "Dunell" comes from her children's marriage certificates.
There's a Samuel Deneault, born about 1847, that shows up in Pontiac, Canada. He died in about 1932. Mary's spouse also grew up in Pontiac, Canada, so I suspect a link. A birthdate of 1847 is too young to be the father, but could be a sibling or cousin.
Mary was born in Quebec according to Canada census data.