Explore the Family Name Kois

The meaning of Kois

Polish: nickname for a peace maker, from a derivative of koić ‘to calm’. In North America, this surname may also be an altered form of the variant Koisz. Some characteristic forenames: Polish Andrzej, Czeslawa, Ryszard, Wladyslaw.

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

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

The surname Kois holds a notable place in the US, based on data derived from the Decennial U.S. Census. In terms of popularity, it ranked 52,174 in 2000 and slightly improved its position to 51,610 by 2010. This subtle increase reflects a change rate of 1.08%. The count of individuals bearing this surname also grew from 374 in 2000 to 403 in 2010, indicating a growth rate of 7.75%. However, the proportion of people with this surname didn't shift much during this period, remaining at a consistent 0.14 per 100,000 individuals.

	2000	2010	Change
Rank	#52,174	#51,610	1.08%
Count	374	403	7.75%
Proportion per 100k	0.14	0.14	0%

Race and Ethnicity of people with the last name Kois

Analyzing the ethnic identity associated with the surname Kois, the data from the Decennial U.S. Census reveals that the majority of the individuals identify as White, making up 96.52% in 2000 and 94.79% in 2010. There was a slight decrease in the percentage of this ethnicity during this period, marked by a change of -1.79%. The Hispanic representation saw an increase within this time frame, moving from 2.14% to 2.98%, reflecting a change of 39.25%. Other ethnic identities, including Asian/Pacific Islander, individuals identifying with two or more races, Black, and American Indian and Alaskan Native, were not significantly prevalent among those bearing the surname Kois.

	2000	2010	Change
White	96.52%	94.79%	-1.79%
Hispanic	2.14%	2.98%	39.25%
Asian/Pacific Islander	0%	0%	0%
Two or More Races	0%	0%	0%
Black	0%	0%	0%
American Indian and Alaskan Native	0%	0%	0%