Meaning and history
Guillermo is the Spanish equivalent of William.
20062006: 621 births, rank #439
2007: 610 births, rank #454
2008: 583 births, rank #476
2009: 534 births, rank #507
2010: 457 births, rank #553
20112011: 408 births, rank #604
2012: 392 births, rank #619
2013: 348 births, rank #688
2014: 376 births, rank #676
2015: 389 births, rank #661
20162016: 322 births, rank #754
2017: 289 births, rank #795
2018: 314 births, rank #751
2019: 320 births, rank #747
2020: 275 births, rank #832
20212021: 299 births, rank #811
2022: 287 births, rank #848
2023: 294 births, rank #833
2024: 299 births, rank #831
20252025: 264 births, rank #901
Guillermo moved from #831 to #902 for boys between 2024 and 2025. Its highest annual birth count came in 1998, with 693 births.