Rex is a distinctive choice, ranked #228 in 2025. Your child is likely to be the only Rex in their class.
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UK Rank 2025
#228
US Rank #859
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About the Name Rex
Rex is gradually declining in popularity, having dropped 73 places over five years. Its high point was #142 in 2021, and it now sits at #216. The name has been a consistent presence in UK records since 1996.
Rex is fairly common in the UK, so your child is very likely to be the only Rex in their class.
In the US it sits at #794 โ notably more popular in the UK than across the Atlantic.
Rex Harrison โ Sir Reginald Carey Harrison was an English actor.
Rex Tillerson โ Rex Wayne Tillerson is an American energy executive and former diplomat who served as the 69th United States secretary of state from 2017 to 2018 in the first administration of Donald Trump.
Biographical summaries are shortened from Wikipedia and are used under the CC BY-SA 4.0 licence; those summaries remain available under that same licence.
Frequently Asked Questions
Common questions about the name Rex
Unlikely. With around 217 UK babies named Rex per year, your child will almost certainly be the only Rex in their class, and possibly the only one in the whole school.
Rex has been fairly steady, ranked #228 in 2025 against #143 in 2020. Its best recorded position was #142 in 2021.
Rex is more popular in the UK (#216) than in the US (#794). Names with strong rankings in both countries tend to have broad cross-cultural appeal, working well for international families or those with ties to both nations.
Notable people named Rex include: Rex Lee (actor), Rex Tillerson and Rex Sinquefield. Short summaries for each appear below.
Rex ranks #794 in the US top 1,000 (2024). It's recognised in America but considerably more popular in the UK.
217
UK babies named Rex (2025)
~0.0
Expected classmates with this name (class of 28)
~0.1
In a school of 600
↓ 85 places
Rank change (last 5 years)
🏫 Who else is in the room?
In a typical UK class of 28, highlighted children share the name Rex
Almost certainly the only Rex in the class
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UK Popularity (1996–2025)
Rank and birth count · ONS official data
US Popularity (2020–2025)
Rank · SSA official data
✨ Similar names to Rex
Names with a similar style — each with their own classroom story
Rex Wayne Tillerson is an American energy executive and former diplomat who served as the 69th United States secretary of state from 2017 to 2018 in the first administration of Donald Trump.
Rex Andrew Sinquefield is an American businessman, investor, and philanthropist who has been called an 'index-fund pioneer' for contributing to the early development and popularization of passively managed index funds among retail investors.
Oedipus Rex, also known by its Greek title, Oedipus Tyrannus (Ancient Greek: ฮแผฐฮดฮฏฯฮฟฯ ฯ ฮคฯฯฮฑฮฝฮฝฮฟฯ, pronounced [oidรญpuหs tรฝrannos]), or Oedipus the King, is an Athenian tragedy written by Sophocles.
Rex 84B, short for Readiness Exercise 1984 Bravo, was a classified scenario and drill developed by the United States federal government to detain large numbers of United States residents deemed to be "national security threats" in the event that the president declared a National Emergency.