Boy, you have your hands full if you are trying to keep track of the Gunns in Elgin and Oxford Counties! Not sure if you have this info.......

Ontario Cemetery Finding Aid (not a complete index)
http://ocfa.islandnet.com//search.php

Headstone photos - many cemeteries in Elgin have been done.
Surname search is at bottom.
http://cemetery.canadagenweb.org/ON/index.html

Many Gunns here:
Love Cemetery
http://www.rootsweb.ancestry.com/~cancemet/ON/ONL10584/

Black's
http://cemetery.canadagenweb.org/ON/ONB10622/

Elgin County OGS - free cemetery transcriptions, newspaper index, research help, etc.
http://www.elginogs.ca/

Oxford County Cemeteries
http://freepages.genealogy.rootsweb.ancestry.com/~dcoop/
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http://www.familysearch.org/eng/default.asp

Household Record 1881 Canadian Census

Household:

Name Marital Status Gender Ethnic Origin Age Birthplace Occupation Religion

John GUNN M Male Scottish 38 Ontario Farmer Presbyterian Canada
Willimina GUNN M Female Scottish 37 Scotland Presbyterian Canada
Alexander GUNN Male Scottish 14 Ontario Student Presbyterian Canada
C. A. GUNN Female Scottish 12 Ontario Student Presbyterian Canada
Georgina GUNN Female Scottish 10 Ontario Student Presbyterian Canada
W. J. GUNN Male Scottish 7 Ontario Student Presbyterian Canada
D. J. GUNN Male Scottish 5 Ontario Presbyterian Canada
D. F. GUNN Male Scottish 1 Ontario Presbyterian Canada
--------------------------------------------------------------------------------
Source Information:
Census Place Gwillimbury West, Simcoe South, Ontario
Family History Library Film 1375886
NA Film Number C-13250
District 138
Sub-district B
Division 1
Page Number 9
Household Number 40

*********************************************************
Nearby households....

Household:

Name Marital Status Gender Ethnic Origin Age Birthplace Occupation Religion

Alexander GUNN W Male Scottish 79 Scotland Farmer Presbyterian Canada
--------------------------------------------------------------------------------
Source Information:
Census Place Gwillimbury West, Simcoe South, Ontario
Family History Library Film 1375886
NA Film Number C-13250
District 138
Sub-district B
Division 1
Page Number 9
Household Number 39

********************************************************
Household:

Name Marital Status Gender Ethnic Origin Age Birthplace Occupation Religion

David GUNN M Male Scottish 43 Ontario Farmer Presbyterian Canada
Euphemia GUNN M Female Scottish 36 Ontario Presbyterian Canada
--------------------------------------------------------------------------------
Source Information:
Census Place Gwillimbury West, Simcoe South, Ontario
Family History Library Film 1375886
NA Film Number C-13250
District 138
Sub-district B
Division 1
Page Number 10
Household Number 41

***************************************************
Household:

Name Marital Status Gender Ethnic Origin Age Birthplace Occupation Religion

Henry MCKAY M Male Scottish 66 Scotland Farmer Presbyterian Canada
Isabella MCKAY Female Scottish 28 Ontario Presbyterian Canada
Ellen MCKAY M Female Scottish 48 Ontario Presbyterian Canada
Angus MCKAY Male Scottish 25 Ontario Farmer Presbyterian Canada
Alexander MCKAY Male Scottish 23 Ontario Presbyterian Canada
William G. MCKAY Male Scottish 21 Ontario Farmer Presbyterian Canada
Amnis MCKAY Male Scottish 21 Ontario Farmer Presbyterian Canada
Donald MCKAY Male Scottish 18 Ontario Farmer Presbyterian Canada
Catherine MCKAY Female Scottish 18 Ontario Presbyterian Canada
Louise MCKAY Female Scottish 13 Ontario Student Presbyterian Canada
James MCKAY Male Scottish 16 Ontario Student Presbyterian Canada
Angus SUTHERLAND Male Scottish 95 Scotland Presbyterian Canada
--------------------------------------------------------------------------------
Source Information:
Census Place Gwillimbury West, Simcoe South, Ontario
Family History Library Film 1375886
NA Film Number C-13250
District 138
Sub-district B
Division 1
Page Number 10
Household Number 45

********************************************************
Household:

Name Marital Status Gender Ethnic Origin Age Birthplace Occupation Religion

Donald GUNN M Male Scottish 45 Ontario Farmer Presbyterian Canada
Sarah E. GUNN M Female Irish 26 Ontario Presbyterian Canada
Christina M. GUNN Female Scottish 5 Ontario Presbyterian Canada
Norval GUNN Male Scottish 1 Ontario Presbyterian Canada
Rose CORDELLE Female Spanish 15 England Servant Church of England
--------------------------------------------------------------------------------
Source Information:
Census Place Gwillimbury West, Simcoe South, Ontario
Family History Library Film 1375886
NA Film Number C-13250
District 138
Sub-district B
Division 1
Page Number 11
Household Number 47


1881 original images (very poor quality)
http://data2.collectionscanada.gc.ca/e/e328/e008184867.jpg (bottom)
http://data2.collectionscanada.gc.ca/e/e328/e008184868.jpg (top)

1891 original image (much better!)
http://www.collectionscanada.gc.ca/databases/census-1891/001...
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Other censuses (where are they??)
http://automatedgenealogy.com/index.html

Some newspaper articles
http://news2.ourontario.ca/results?&fz=0&q=gunn&...
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Sorry, I haven't been able to find an account or obituary of David Frederick's death due to a train accident.