Last name is Decker per marriage information of daughter Mabel.[1]
Sources
↑ "New York, New York City Marriage Records, 1829-1940," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:24ZD-7YT : 10 February 2018), Harriet Decker in entry for Adrian Murray and Mabelle Beck, 05 Nov 1910; citing Marriage, Manhattan, New York, New York, United States, New York City Municipal Archives, New York; FHL microfilm 1,503,873.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MNDQ-C13 : 13 August 2017), Hattie Beck in household of Julius Beck, Westfield, Union, New Jersey, United States; citing enumeration district ED 190, sheet 583B, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0801; FHL microfilm 1,254,801.
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