The baby name Guillermo appears in baby name data for the United States from 1910 to 2024. It was most popular in 2001 with 519 babies given the name.
In the later years of this period, Guillermo has become more popular compared with earlier years.
| Year | Count |
|---|---|
| 1910 | 9 |
| 1911 | 5 |
| 1912 | 9 |
| 1913 | 6 |
| 1914 | 16 |
| 1915 | 25 |
| 1916 | 11 |
| 1917 | 34 |
| 1918 | 23 |
| 1919 | 32 |
| 1920 | 57 |
| 1921 | 36 |
| 1922 | 44 |
| 1923 | 56 |
| 1924 | 57 |
| 1925 | 69 |
| 1926 | 73 |
| 1927 | 64 |
| 1928 | 67 |
| 1929 | 64 |
| 1930 | 75 |
| 1931 | 117 |
| 1932 | 6 |
| 1933 | 16 |
| 1934 | 10 |
| 1935 | 6 |
| 1936 | 16 |
| 1937 | 13 |
| 1938 | 9 |
| 1939 | 6 |
| 1940 | 55 |
| 1941 | 71 |
| 1942 | 33 |
| 1943 | 61 |
| 1944 | 53 |
| 1945 | 69 |
| 1946 | 65 |
| 1947 | 87 |
| 1948 | 170 |
| 1949 | 100 |
| 1950 | 91 |
| 1951 | 18 |
| 1952 | 22 |
| 1953 | 12 |
| 1954 | 25 |
| 1955 | 245 |
| 1956 | 279 |
| 1957 | 184 |
| 1958 | 153 |
| 1959 | 220 |
| 1960 | 227 |
| 1961 | 107 |
| 1962 | 187 |
| 1963 | 208 |
| 1964 | 174 |
| 1965 | 191 |
| 1966 | 167 |
| 1967 | 214 |
| 1968 | 247 |
| 1969 | 246 |
| 1970 | 178 |
| 1971 | 204 |
| 1972 | 152 |
| 1973 | 204 |
| 1974 | 234 |
| 1975 | 216 |
| 1976 | 267 |
| 1977 | 225 |
| 1978 | 192 |
| 1979 | 264 |
| 1980 | 240 |
| 1981 | 260 |
| 1982 | 284 |
| 1983 | 246 |
| 1984 | 230 |
| 1985 | 221 |
| 1986 | 183 |
| 1987 | 190 |
| 1988 | 270 |
| 1989 | 277 |
| 1990 | 279 |
| 1991 | 262 |
| 1992 | 412 |
| 1993 | 357 |
| 1994 | 350 |
| 1995 | 335 |
| 1996 | 379 |
| 1997 | 376 |
| 1998 | 424 |
| 1999 | 443 |
| 2000 | 450 |
| 2001 | 519 |
| 2002 | 384 |
| 2003 | 332 |
| 2004 | 424 |
| 2005 | 490 |
| 2006 | 447 |
| 2007 | 373 |
| 2008 | 387 |
| 2009 | 385 |
| 2010 | 379 |
| 2011 | 297 |
| 2012 | 377 |
| 2013 | 319 |
| 2014 | 289 |
| 2015 | 390 |
| 2016 | 347 |
| 2017 | 225 |
| 2018 | 254 |
| 2019 | 257 |
| 2020 | 76 |
| 2021 | 255 |
| 2022 | 189 |
| 2023 | 179 |
| 2024 | 204 |