Explore the Family Name Demchak

The meaning of Demchak

1. Ukrainian and Rusyn: patronymic from the personal name Demko 2, formed with the diminutive suffix -ak. 2. Americanized form of Slovak, Czech, and Rusyn (from Slovakia) Demčák or Demčak, and Polish Demczak: patronymic from the personal name Demko 1 or 2, formed with the diminutive suffix -ak/-ák.

Dictionary of American Family Names, 2nd edition, © Oxford University Press, 2022.

How common is the last name Demchak in the United States?

Based on the Decennial U.S. Census, the surname Demchak showed a slight decrease in popularity between 2000 and 2010. In 2000, Demchak ranked 30,120th among all surnames in the United States, but by 2010 it had slipped to 32,031st—a 6.34% decline. There were also fewer individuals bearing the name; the count fell from 734 in 2000 to 720 in 2010, marking a 1.91% drop. Consequently, the proportion of people with the surname Demchak per 100k population decreased by 11.11% over that decade.

	2000	2010	Change
Rank	#30,120	#32,031	-6.34%
Count	734	720	-1.91%
Proportion per 100k	0.27	0.24	-11.11%

Race and Ethnicity of people with the last name Demchak

Regarding ethnicity, the majority of individuals with the last name Demchak identified as White according to the Decennial U.S. Census data, comprising 97.14% in 2000 and 96.25% in 2010. The percentage of those claiming two or more ethnicities increased by 40.37%, moving from 1.09% to 1.53%. Similarly, there was a significant increase in those identifying as Hispanic, jumping from 1.09% in 2000 to 1.94% in 2010—an impressive 77.98% rise. However, no individuals with the surname Demchak identified as Asian/Pacific Islander, Black, or American Indian and Alaskan Native during either census year.

	2000	2010	Change
White	97.14%	96.25%	-0.92%
Hispanic	1.09%	1.94%	77.98%
Two or More Races	1.09%	1.53%	40.37%
Asian/Pacific Islander	0%	0%	0%
Black	0%	0%	0%
American Indian and Alaskan Native	0%	0%	0%