Willo is a rare variant of Willow that peaked in 1924 and has since faded.
Willo is a girl name. In 2025 it ranked #10,871 for girl births in the United States (and #18,379 across all names), given to 9 babies. Willo was first reported in SSA data in 1911 and peaked in 1924 (23 births).
| Year | U.S. births | U.S. + territories | Rank |
|---|---|---|---|
| 2025 | 9 | 9 | #10,871 |
| 2023 | 8 | 8 | #12,127 |
| 2022 | 6 | 6 | #15,194 |
| 2021 | 11 | 11 | #9,515 |
| 2020 | 5 | 5 | #17,386 |
| 2018 | 13 | 13 | #8,584 |
| 2017 | 8 | 8 | #12,663 |
| 2016 | 13 | 13 | #8,850 |
| 2015 | 9 | 9 | #11,794 |
| 2014 | 6 | 6 | #16,408 |
| 2013 | 9 | 9 | #11,913 |
| 2012 | 9 | 9 | #12,160 |
| 2011 | 7 | 7 | #14,753 |
| 2009 | 7 | 7 | #15,164 |
| 2008 | 5 | 5 | #20,337 |
| 2007 | 9 | 9 | #12,625 |
| 2004 | 5 | 5 | #18,712 |
| 2003 | 6 | 6 | #15,699 |
| 2001 | 6 | 6 | #15,285 |
| 1963 | 7 | — | #5,884 |
| 1958 | 8 | — | #4,884 |
| 1954 | 6 | — | #5,742 |
| 1953 | 6 | — | #5,662 |
| 1952 | 5 | — | #6,382 |
| 1950 | 5 | — | #6,096 |
| 1949 | 7 | — | #4,660 |
| 1948 | 7 | — | #4,643 |
| 1947 | 10 | — | #3,699 |
| 1946 | 8 | — | #3,989 |
| 1943 | 10 | — | #3,244 |
| 1942 | 11 | — | #2,984 |
| 1940 | 10 | — | #2,958 |
| 1939 | 12 | — | #2,586 |
| 1938 | 19 | — | #1,872 |
| 1937 | 9 | — | #3,143 |
| 1936 | 15 | — | #2,150 |
| 1935 | 15 | — | #2,203 |
| 1934 | 21 | — | #1,696 |
| 1933 | 14 | — | #2,271 |
| 1932 | 23 | — | #1,633 |
| 1931 | 17 | — | #2,023 |
| 1930 | 21 | — | #1,813 |
| 1929 | 16 | — | #2,184 |
| 1928 | 16 | — | #2,281 |
| 1927 | 15 | — | #2,429 |
| 1926 | 14 | — | #2,566 |
| 1925 | 13 | — | #2,772 |
| 1924 | 23 | — | #1,871 |
| 1923 | 6 | — | #4,955 |
| 1922 | 13 | — | #2,777 |
| 1921 | 19 | — | #2,115 |
| 1920 | 12 | — | #2,895 |
| 1919 | 5 | — | #5,545 |
| 1918 | 9 | — | #3,506 |
| 1917 | 15 | — | #2,309 |
| 1916 | 8 | — | #3,544 |
| 1915 | 8 | — | #3,425 |
| 1914 | 10 | — | #2,429 |
| 1913 | 5 | — | #3,696 |
| 1912 | 6 | — | #2,969 |
| 1911 | 7 | — | #2,187 |