Arthur was Estelle's second husband, so Caroll may have been the name of her first husband. However her father's last name is not given in the record index (William F.), suggesting that it was the same as hers. Her mother's name was Rose Oelschlaeger.
Sources
"New York, New York City Marriage Records, 1829-1940," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:2435-Q2J : 20 March 2015), Arthur S. Hoyt and Estelle H. Carroll, 28 Feb 1913; citing Marriage, Manhattan, New York, New York, United States, New York City Municipal Archives, New York; FHL microfilm 1,613,704.
"United States Passport Applications, 1795-1925," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QVJG-TLZN : 4 September 2015), Estelle S Hoyt in entry for Arthur S Hoyt, 1913; citing Passport Application, New York, United States, source certificate #88557, Passport Applications, January 2, 1906 - March 31, 1925, 177, NARA microfilm publications M1490 and M1372 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,510,399.
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