What does the name Rex mean?

Rex is a boy name of Latin origin: means 'king'.

When was the name Rex most popular?

In US Social Security records since 1890, Rex peaked in the 1930s and the 2020s in nearly equal measure.

What are names similar to Rex?

Names similar to Rex in origin and style include Max, Maximilian, Reign, James, Lex.

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Rex

boy name

Origin

Latin

Syllables

Peak era

1930s/2020s

Today

▬ Steady

Meaning

means 'king'

Popularity, 1890–2024

1890speak 1930s2020s

Shape drawn from US Social Security baby-name records. Rex peaked in the 1930s and the 2020s in nearly equal measure.

See popularity in Brazil

Popularity in Brazil

27 people · the #101,516 first name in Brazil · median age 51

Source: IBGE, Censo Demográfico 2022

Names that fit alongside Rex

Max Maximilian Reign James Lex Maximus

The Rex deep dive

Written for you · $1.99 →

Whether you’re naming a baby or exploring your own name’s history, this is a personal letter, not a list: where Rex truly comes from, how it traveled, and what a century of records reveals. If you have grown a tree on nametree, it also considers how Rex fits with your family’s names and surname.

Both reports, explained →

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