first name
GUILLERMO
of 53,615 first names recorded in the 2020 Census
Of the 61,844 people named Guillermo, 96.8% reported their origin as Hispanic or Latino, 1.4% as White and 1.3% as Asian or Pacific Islander. Virtually all are male (99.8%). These count how people described themselves on the 2020 Census, not where the name comes from.
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Guillermo peaked in 1998, when 693 babies got the name.
At least 32,148 babies have been given the name since 1885. Years SSA withheld, because fewer than 5 were born, are skipped rather than drawn as zero. * 2025 is the newest year published and it undercounts: a card application is filed some time after a birth.
Guillermo by decade
Among all names given to American babies, its best decade was the 1990s, when it ranked #774. The largest share of babies named Guillermo, 29.1%, were born between 1997 and 2012, as Generation Z.
Rank counts both sexes together, among every name SSA recorded that decade; the number under it is births. The 2020s run only to 2025. Generation years follow Pew Research Center, which has not named a generation after 2012.
Where Guillermo is most common
Compared with all babies born in each state since 1910, Guillermo has been most common in Arizona (4.2×), Texas (4×), and California (3.8×), and least common in Pennsylvania (0.04×).
28,991 births recorded by state, 1910–2025. 2× means twice as common as nationally. States with fewer than 30 such births are left blank, and SSA withholds any year with fewer than 5 in a state, so small states read low.
Either side of Guillermo
Spelled almost the same
4 first names in the 2020 Census spelled within a letter or two of Guillermo, most common first.
Also a last name
As a last name, Guillermo ranks #8,791 of 156,621, with 3,579 people. See Guillermo as a last name
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