The baby name Koichi appears in baby name data for the United States from 1917 to 1927. It was most popular in 1921 with 19 babies given the name.
Over the period shown, Koichi has stayed at a similar level of popularity.
| Year | Count |
|---|---|
| 1917 | 12 |
| 1918 | 18 |
| 1919 | 14 |
| 1921 | 19 |
| 1922 | 10 |
| 1923 | 12 |
| 1924 | 16 |
| 1925 | 12 |
| 1926 | 10 |
| 1927 | 14 |