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Name Biscuit

Boy name

Rex

Rex ranks #40 out of 6,032 boy dog names in our data (the #1 boy dog name is Charlie). Across all 17 places, 907 dogs carry the name. It's also a cat name: #76 among boy cat names.
Rex's popularity trend

Rex's share of dogs, year by year — or toggle to its yearly rank. Peak year by share: 2023.

0.05%0.1%0.15%200720112015201920232025
Dogs in our data
907
across 17 places
Popularity rank
#40
of 6,032 boy dog names
5-year rank move
+9
2020 → 2025
Gender split
99% boys
1% girls99% boys
What does Rex mean?
/ɹɛks/1 syllableOrigin: Latin

Rex comes straight from the Latin word rex, meaning “king.” It's been used as a given name and title since antiquity, and it caught on for dogs in particular because of that regal, commanding sound.

Rex has a bold, old-school confidence to it, suiting a pet with real presence, whether that's a barrel-chested guard dog or a cat who clearly runs the household. Short and strong, it's a name that gets said with authority.

Etymology & pronunciation from Wiktionary (CC BY-SA 4.0).

Where Rex shows up

Rex's share of each place's counted dogs. Places count differently — hover a Share figure for the basis. Click a heading to sort.

PlayfordAustralia0.4%
TorontoCanada0.4%
Surf Coast ShireAustralia0.3%
Port Adelaide EnfieldAustralia0.3%
DarwinAustralia0.3%
ProspectAustralia0.2%
BurnsideAustralia0.2%
Noosa ShireAustralia0.2%
New York CityUnited States of America0.1%
Allegheny CountyUnited States of America0.1%
CambridgeUnited States of America0.1%
Maple RidgeCanada0.1%
AdelaideAustralia0.1%
WorcesterUnited States of America0.1%
SeattleUnited States of America0.1%
Basel-StadtSwitzerland0.1%
ZürichSwitzerland0.1%

Names like Rex

RexieRexxT-RexWrexRexyRexiTrex

Rex appears on

Paw Patrol Dog NamesGood Boy Dog NamesBest Boy Dog NamesStrong Boy Dog NamesMovie Dog Names

Rex means, by theme

Royal & noble