Explore the Family Name Koga
The meaning of Koga
Japanese: meaning ‘old river’ and variously written, such as 古河 or 古賀, with one ancient variant of imperial descent written 久我 and pronounced Kuga; other alternate readings are Furukawa or Kogawa and are derived from a village named Koga in Shimōsa (now Chiba prefecture). The most common Koga name is mainly found in Kyūshū, and is descended from the Takeda family. The name is also found in the Ryūkyū Islands. Some characteristic forenames: Japanese Toshio, Akira, Hiroshi, Masao, Yoshio, Yoshitaka, Chiyoko, Emiko, Hajime, Harumi, Hideko, Hideo.
Dictionary of American Family Names, 2nd edition, © Oxford University Press, 2022.
How common is the last name Koga in the United States?
Based on the Decennial U.S. Census data, the popularity of the surname Koga has seen a slight decline in the United States between 2000 and 2010. In 2000, Koga was ranked as the 20,427th most popular surname and decreased to the 22,450th position by 2010, marking a change of -9.9%. The number of people with the Koga surname reduced from 1,209 in 2000 to 1,146 in 2010, a decrease of approximately 5.21%. The proportion of individuals with the Koga surname per 100k population also fell by 13.33% over this decade.
| 2000 | 2010 | Change | |
|---|---|---|---|
| Rank | #20,427 | #22,450 | -9.9% |
| Count | 1,209 | 1,146 | -5.21% |
| Proportion per 100k | 0.45 | 0.39 | -13.33% |
Race and Ethnicity of people with the last name Koga
The ethnic identity associated with the surname Koga, according to the Decennial U.S. Census, remained predominantly Asian/Pacific Islander between 2000 and 2010, despite a slight dip of 0.90%. However, there was a significant increase of 76.25% in individuals identifying as two or more races during the same period. The percentage of those identifying as White with the Koga surname dropped by 24.73%, while the Hispanic population saw a minor increase of 2.95%. The Black population with the Koga surname saw a reduction of 15.66%. There were no individuals identified as American Indian and Alaskan Native within both census years.
| 2000 | 2010 | Change | |
|---|---|---|---|
| Asian/Pacific Islander | 70.8% | 70.16% | -0.9% |
| White | 18.2% | 13.7% | -24.73% |
| Two or More Races | 6.78% | 11.95% | 76.25% |
| Hispanic | 3.39% | 3.49% | 2.95% |
| Black | 0.83% | 0.7% | -15.66% |
| American Indian and Alaskan Native | 0% | 0% | 0% |