Rocko is a very rare variant of Rocky that peaked in 2014 and remains in steady use.
Rocko is a boy name. In 2025 it ranked #5,567 for boy births in the United States (and #11,739 across all names), given to 17 babies. Rocko first appears in 1975 and peaked in 2014 (22 births).
| Year | U.S. births | U.S. + territories | Rank |
|---|---|---|---|
| 2025 | 17 | 17 | #5,567 |
| 2024 | 11 | 11 | #7,651 |
| 2023 | 18 | 18 | #5,417 |
| 2022 | 15 | 15 | #6,087 |
| 2021 | 16 | 16 | #5,734 |
| 2020 | 19 | 19 | #4,998 |
| 2019 | 11 | 11 | #7,536 |
| 2018 | 22 | 22 | #4,581 |
| 2017 | 8 | 8 | #9,513 |
| 2016 | 16 | 16 | #5,739 |
| 2015 | 15 | 15 | #5,938 |
| 2014 | 22 | 22 | #4,507 |
| 2013 | 14 | 14 | #6,178 |
| 2012 | 8 | 8 | #9,525 |
| 2011 | 10 | 10 | #7,955 |
| 2010 | 13 | 13 | #6,630 |
| 2009 | 13 | 13 | #6,736 |
| 2008 | 9 | 9 | #8,869 |
| 2007 | 10 | 10 | #8,050 |
| 2006 | 7 | 7 | #10,433 |
| 2004 | 5 | 5 | #12,842 |
| 2002 | 7 | 7 | #9,185 |
| 1975 | 5 | — | #6,147 |