1990 US Census
Accoring to the US Census Bureau, Duckworth ranked #2,354 in frequency out of 88,799 surnames for which statistics were released from the 1990 Census. Approximately 1 in every 20,000 individuals in the US had this surname in 1990.
Occurring Surnames from Census 1990", US Census Bureau.
Histopols Grave Index
for the surname