The baby name Iwao appears in baby name data for the United States from 1917 to 1927. It was most popular in 1921 with 18 babies given the name.
Over the period shown, Iwao has stayed at a similar level of popularity.
| Year | Count |
|---|---|
| 1917 | 16 |
| 1920 | 12 |
| 1921 | 18 |
| 1922 | 14 |
| 1923 | 16 |
| 1924 | 14 |
| 1925 | 12 |
| 1926 | 12 |
| 1927 | 18 |