Meaning and history
Rex is a given name derived from the Latin word rex, meaning “king,” and has been in use as a first name since the 19th century.
20062006: 252 births, rank #809
2007: 236 births, rank #874
2008: 274 births, rank #799
2009: 303 births, rank #755
2010: 332 births, rank #703
20112011: 386 births, rank #618
2012: 385 births, rank #631
2013: 391 births, rank #630
2014: 389 births, rank #661
2015: 374 births, rank #679
20162016: 423 births, rank #631
2017: 434 births, rank #607
2018: 421 births, rank #631
2019: 410 births, rank #651
2020: 377 births, rank #681
20212021: 380 births, rank #698
2022: 380 births, rank #696
2023: 368 births, rank #721
2024: 320 births, rank #785
20252025: 281 births, rank #859
Rex moved from #787 to #859 for boys between 2024 and 2025. Its highest annual birth count came in 1951, with 1,503 births.