Not so fabulously experienced but here's what I found. The daughter born to James and Narcisse in 1880 was named after her mother. The spellings are not the best, but that appears to be her birth name. Nercissa/Nersus.
In 1881 she is called 'Maud' but in 1891 it appears again as the name is Nercissa
https://familysearch.org/search/records/results#count=20&query=%2Bsurname%3Amiller~%20%2Bbirth_place%3Acan~%20%2Bbirth_year%3A1870-1889~%20%2Bfather_givenname%3Ajames~%20%2Bfather_surname%3Amiller~%20%2Bmother_givenname%3Anarcisse~%20%2Bmother_surname%3Aholmes~
British Columbia, Death Registrations
Harriet Miller
Death 24 Mar 1912 Vancouver, BC, CAN
Female age: 40 Single
birth 13 Feb 1872 birthplace: , Ontario
father: James Miller mother: Narcisse Holmes
Canada, Births and Baptisms, 1661-1959
Miller Male
birth 20 Oct 1879 birthplace: Pembroke, Renfrew, Ontario
father James Miller mother Nersus Holmes
Millar Male
birth 31 Oct 1878 Pembroke, Renfrew, Ontario
father James Millar mother Narcisse Holmes
Nersus Miller Female
birth 08 Oct 1880 Pembroke, Renfrew, Ontario
father Jas. Miller mother Nersus Holmes
British Columbia, Death Registrations, 1872-1986
Gertrude May Wright
Death 22 Feb 1946 : Vancouver, BC
Female age: 65 Married
birth 08 Oct 1880 Ontario
father: James Miller mother: Narcysa Holmes
spouse: Lorenzo Duncan Wright
Canada Census, 1891 Renfrew North Pembroke Town, Ont
https://familysearch.org/search/records/results#count=20&query=%2Bsurname%3Amiller~%20%2Bresidence_place%3A%22Renfrew%20North%2C%20Ontario%2C%20Canada%22%20%2Bresidence_year%3A1891-1891~&offset=20
The above URL shows each family member individually - included James, Narcisse, Harriet, Robert and:
name: Nercissa Millar
Female age: 11 est birth 1880 Ontario
Single Methodist
province: Ontario district: Renfrew North district number: 113
sub-district: Pembroke Town
Canada Census, 1881 Pembroke (Town), Renfrew North, Ontario, Canada
district number: 114 sub district: E
https://familysearch.org/pal:/MM9.1.1/MVXN-XPB
James Miller M 29y Ireland
Nercisus Miller F 26y Ontario
Hariet Miller F 9y Quebec
Robert Miller M 7y Quebec
Maud Miller F 6m Ontario
Robert C. Miller M 30y Ireland
Thomas Miller M 26y Ireland
Margaret Miller F 18y Quebec
Kate Miller F 17y Quebec
