He appears to have used the surname Pastorius from the time of his marriage in 1938
Sources
1920 United States Federal Census - William B Pistorius
1930 United States Federal Census - William B Pistorius
1938 Indiana, Marriages, 1810-2001 - William Pastorius
1940 United States Federal Census - William B Pastorius
1944 U.S., World War II Army Enlistment Records, 1938-1946 - William B Pastorius
U.S., Social Security Death Index, 1935-2014 - William Pastorius
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