Piatt and Pratt both show up on sources as maiden name.
Sources
"Arkansas, County Marriages, 1837-1957," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:NMTV-N6R : 18 March 2019), Gussie Pratt in entry for D S Brent, 22 Nov 1915; citing Marriage, Hot Spring, Arkansas, United States, county offices, Arkansas; FHL microfilm 1,011,254.
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