Castulo is a very rare boys' name that peaked in 1924 and has since faded.
Castulo is a boy name. It last appears in U.S. records in 2018. Castulo was first reported in SSA data in 1914 and peaked in 1924 (9 births).
| Year | U.S. births | U.S. + territories | Rank |
|---|---|---|---|
| 2018 | 5 | 5 | #12,497 |
| 1998 | 8 | 8 | #6,948 |
| 1975 | 5 | — | #5,583 |
| 1963 | 6 | — | #3,698 |
| 1958 | 5 | — | #4,037 |
| 1952 | 5 | — | #3,817 |
| 1949 | 5 | — | #3,764 |
| 1947 | 5 | — | #3,800 |
| 1943 | 5 | — | #3,616 |
| 1942 | 6 | — | #3,268 |
| 1938 | 5 | — | #3,598 |
| 1934 | 6 | — | #3,340 |
| 1929 | 5 | — | #4,051 |
| 1928 | 8 | — | #3,118 |
| 1926 | 5 | — | #4,298 |
| 1925 | 5 | — | #4,296 |
| 1924 | 9 | — | #3,058 |
| 1923 | 6 | — | #3,882 |
| 1920 | 5 | — | #4,395 |
| 1914 | 7 | — | #2,690 |