Kazuo is a rare boys' name that peaked in 1921 and has since faded.
Kazuo is a boy name. In 2025 it ranked #12,988 for boy births in the United States (and #26,711 across all names), given to 5 babies. Kazuo first appears in 1911 and peaked in 1921 (57 births).
| Year | U.S. births | U.S. + territories | Rank |
|---|---|---|---|
| 2025 | 5 | 5 | #12,988 |
| 2009 | 7 | 7 | #10,458 |
| 2008 | 7 | 7 | #10,492 |
| 2007 | 5 | 5 | #13,426 |
| 2006 | 5 | 5 | #13,061 |
| 1944 | 5 | — | #3,683 |
| 1943 | 6 | — | #3,394 |
| 1939 | 6 | — | #3,293 |
| 1938 | 7 | — | #3,025 |
| 1937 | 6 | — | #3,340 |
| 1936 | 7 | — | #3,027 |
| 1935 | 13 | — | #2,089 |
| 1934 | 6 | — | #3,487 |
| 1932 | 20 | — | #1,621 |
| 1931 | 16 | — | #1,890 |
| 1930 | 25 | — | #1,480 |
| 1929 | 18 | — | #1,832 |
| 1928 | 21 | — | #1,677 |
| 1927 | 32 | — | #1,311 |
| 1926 | 31 | — | #1,313 |
| 1925 | 39 | — | #1,133 |
| 1924 | 36 | — | #1,214 |
| 1923 | 44 | — | #1,076 |
| 1922 | 53 | — | #965 |
| 1921 | 57 | — | #933 |
| 1920 | 44 | — | #1,059 |
| 1919 | 48 | — | #978 |
| 1918 | 44 | — | #1,023 |
| 1917 | 34 | — | #1,159 |
| 1916 | 30 | — | #1,227 |
| 1915 | 30 | — | #1,199 |
| 1914 | 17 | — | #1,526 |
| 1913 | 20 | — | #1,160 |
| 1912 | 12 | — | #1,482 |
| 1911 | 6 | — | #1,643 |