Boy name
Rex
Rex is currently the #859 boy name in the United States, based on 2025 Social Security data. In raw numbers: 281 babies. It has drifted down the charts over the past five years, from #681 to #859. Looking at the full record since 1880, Rex hit its all-time high of #170 in 1951, when 1,503 boys were given the name. State by state, Utah leads the way at #351.
Rankings
2025 rank
#859
among boy names
Trend
Falling
last 5 years
All-time peak
#170
in 1951 (1950s)
Babies in 2025
281
boys named Rex
Rex popularity, 1880–2025
Where Rex is most popular
Share of boys born in 2025:lowhighno data (< 5 births)
Strongest states: Utah (#351), Oklahoma (#504), Arizona (#559)
Uniqueness score
51/ 100Balanced
everywhereone of a kind
Well known, but far from crowded — the middle of the field. Based on how many babies per birth were named Rex in the most recent year of SSA data.
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