I've tried to expand Victor Borges tree on the danish side, and added quite a few people. I don't think the breakthrough is going to occur here though.
But I do have a candidate with potential. I've enclosed a few juicy leads, surely that should be sufficient to track him down.
Thorkild Casimir Darville went to New York in 1904 aboard the S.S. Finlandia sailing from Antwerpen on June 11th., to visit a friend, and apparently decided to stay.
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1940 Census
Thorkild D D'Arrille
Age: 55, born abt 1885
Birthplace: Denmark
5420 Rutland Street
Philadelphia, Pennsylvania
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Thorkild Clarence Darville.
Birth. 17 Jul 1884 Denmark.
Residence. 1942 Richmond, Virginia
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U.S. Marine Corps Muster Rolls, 1798-1958
DRAFT, ENLISTMENT AND SERVICE
Name: Thorkild Cassimer Moses Joseft Darville
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Marriage: 1918 - Brooklyn, New York City, New York, United States
Date: 24. okt. 1918
Groom: Thorkeld C Darille
Bride: Volberg Winkel
Licens #: 15147