Later records such as his WWII draft card and the California death index spell his first name as Birt.
Sources
↑ "United States World War I Draft Registration Cards, 1917-1918," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KZVN-TLK : accessed 22 February 2016), Bert Melton Mckenney, 1917-1918; citing Los Angeles City no 15, California, United States, NARA microfilm publication M1509 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,530,904.
↑ "United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MHQD-P6X : accessed 22 February 2016), Bert M Mc Kenney, Los Angeles Assembly District 61, Los Angeles, California, United States; citing sheet 5A, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,820,105.
"United States Census, 1900," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M9PY-X4R : accessed 17 Aug 2014), Jonathan W Mckenney, Buena Park, Fullerton and Yorba Townships, Orange, California, United States; citing sheet 1A, family 1, NARA microfilm publication T623, FHL microfilm 1240095.
"California, County Marriages, 1850-1952," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K8Z2-J1Y : accessed 22 February 2016), Bert M Mckenney and Agnes Nymen, 01 Apr 1911; citing Los Angeles, California, United States, county courthouses, California; FHL microfilm 2,074,037.
"United States World War II Draft Registration Cards, 1942," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:V48T-D17 : accessed 22 February 2016), Birt Melton Mckenney, 1942; citing NARA microfilm publication M1936, M1937, M1939, M1951, M1962, M1964, M1986, M2090, and M2097 (Washington D.C.: National Archives and Records Administration, n.d.).
"California Death Index, 1940-1997," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:VP4M-PNG : accessed 22 February 2016), Birt M Mckenney, 01 Feb 1961; Department of Public Health Services, Sacramento.
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DNA Connections
It may be possible to confirm family relationships with Bert by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Bert: