People with the first name Guillermo
61,844
About 1 in 5,359 Americans had this first name in the 2020 Census.
Measured, privacy-protected national Census count—not a total of historical baby-name records.
U.S. first-name statistics
How common is Guillermo?
Guillermo was the #794 most frequent first name in the 2020 Census.
National rank
#794
More common than 98.5% of listed first names
Peak year
1998
693 SSA-recorded births
2025 births
264
#1,850 across first names
Census frequency
1 in 5,359
Across the 2020 U.S. population
Sex distribution
Reported in the 2020 Census first-name table.
99.8% male0.2% female
Demographic distribution
Aggregated race and Hispanic-origin reporting in the 2020 Census name table.
Reading the result
Guillermo across two different records
The Census count answers “how many people had this name?” using a national snapshot of living residents in 2020. The SSA series answers “when was this name popular?” using Social Security card applications associated with births.
Guillermo reached its highest published annual SSA count in 1998, with 693 recorded births. In 2025, SSA recorded 264 babies with the name.
Names do not determine a person’s identity. Demographic percentages above describe national aggregates and should never be applied to an individual.
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