Alonso is an established variant of Alonzo that peaked in 2010 and remains in steady use.
Alonso is a boy name. In 2025 it ranked #785 for boy births in the United States (and #1,602 across all names), given to 324 babies — 338 including U.S. territories. Alonso was first reported in SSA data in 1915 and peaked in 2010 (380 births).
| Year | U.S. births | U.S. + territories | Rank |
|---|---|---|---|
| 2025 | 324 | 338 | #785 |
| 2024 | 328 | 349 | #769 |
| 2023 | 287 | 299 | #845 |
| 2022 | 340 | 354 | #752 |
| 2021 | 318 | 328 | #778 |
| 2020 | 297 | 305 | #784 |
| 2019 | 316 | 326 | #755 |
| 2018 | 300 | 313 | #772 |
| 2017 | 317 | 336 | #746 |
| 2016 | 319 | 338 | #763 |
| 2015 | 333 | 344 | #733 |
| 2014 | 339 | 349 | #712 |
| 2013 | 348 | 357 | #688 |
| 2012 | 312 | 322 | #742 |
| 2011 | 347 | 361 | #678 |
| 2010 | 380 | 386 | #636 |
| 2009 | 373 | 378 | #659 |
| 2008 | 363 | 363 | #665 |
| 2007 | 363 | 363 | #661 |
| 2006 | 360 | 365 | #644 |
| 2005 | 329 | 329 | #655 |
| 2004 | 297 | 297 | #677 |
| 2003 | 296 | 296 | #669 |
| 2002 | 316 | 316 | #622 |
| 2001 | 243 | 243 | #722 |
| 2000 | 285 | 285 | #639 |
| 1999 | 233 | 233 | #711 |
| 1998 | 220 | 220 | #738 |
| 1997 | 194 | — | #767 |
| 1996 | 193 | — | #763 |
| 1995 | 222 | — | #716 |
| 1994 | 154 | — | #864 |
| 1993 | 198 | — | #740 |
| 1992 | 161 | — | #831 |
| 1991 | 151 | — | #845 |
| 1990 | 157 | — | #812 |
| 1989 | 125 | — | #907 |
| 1988 | 120 | — | #865 |
| 1987 | 95 | — | #968 |
| 1986 | 96 | — | #932 |
| 1985 | 63 | — | #1,181 |
| 1984 | 89 | — | #932 |
| 1983 | 60 | — | #1,166 |
| 1982 | 71 | — | #1,082 |
| 1981 | 62 | — | #1,169 |
| 1980 | 55 | — | #1,238 |
| 1979 | 59 | — | #1,177 |
| 1978 | 60 | — | #1,134 |
| 1977 | 43 | — | #1,392 |
| 1976 | 42 | — | #1,373 |
| 1975 | 51 | — | #1,182 |
| 1974 | 48 | — | #1,198 |
| 1973 | 44 | — | #1,238 |
| 1972 | 40 | — | #1,327 |
| 1971 | 30 | — | #1,597 |
| 1970 | 40 | — | #1,314 |
| 1969 | 24 | — | #1,681 |
| 1968 | 20 | — | #1,789 |
| 1967 | 31 | — | #1,364 |
| 1966 | 20 | — | #1,723 |
| 1965 | 23 | — | #1,625 |
| 1964 | 20 | — | #1,794 |
| 1963 | 25 | — | #1,586 |
| 1962 | 29 | — | #1,456 |
| 1961 | 22 | — | #1,731 |
| 1960 | 22 | — | #1,728 |
| 1959 | 13 | — | #2,299 |
| 1958 | 13 | — | #2,265 |
| 1957 | 17 | — | #1,952 |
| 1956 | 19 | — | #1,822 |
| 1955 | 9 | — | #2,769 |
| 1954 | 18 | — | #1,827 |
| 1953 | 9 | — | #2,713 |
| 1952 | 24 | — | #1,547 |
| 1951 | 11 | — | #2,371 |
| 1950 | 13 | — | #2,112 |
| 1949 | 11 | — | #2,342 |
| 1948 | 11 | — | #2,327 |
| 1947 | 17 | — | #1,850 |
| 1946 | 7 | — | #2,926 |
| 1945 | 5 | — | #3,344 |
| 1944 | 8 | — | #2,634 |
| 1943 | 5 | — | #3,556 |
| 1942 | 5 | — | #3,578 |
| 1941 | 5 | — | #3,517 |
| 1939 | 9 | — | #2,452 |
| 1937 | 10 | — | #2,334 |
| 1936 | 5 | — | #3,559 |
| 1935 | 6 | — | #3,264 |
| 1934 | 7 | — | #2,979 |
| 1933 | 10 | — | #2,371 |
| 1932 | 9 | — | #2,644 |
| 1931 | 7 | — | #3,101 |
| 1930 | 9 | — | #2,781 |
| 1929 | 11 | — | #2,456 |
| 1928 | 9 | — | #2,851 |
| 1927 | 5 | — | #4,219 |
| 1926 | 9 | — | #2,909 |
| 1924 | 6 | — | #3,883 |
| 1923 | 5 | — | #4,251 |
| 1922 | 7 | — | #3,536 |
| 1921 | 5 | — | #4,338 |
| 1920 | 9 | — | #2,971 |
| 1919 | 7 | — | #3,399 |
| 1918 | 7 | — | #3,380 |
| 1917 | 5 | — | #3,999 |
| 1916 | 7 | — | #3,182 |
| 1915 | 5 | — | #3,837 |