How many babies in Australia have been named Theo?

Between 2013 and 2025, Theo was registered for 2,679 babies in the available state datasets.

Is Theo a popular name in Australia?

In 2025, Theo ranked #36 among boys' names in Australia, with 484 registrations.

boys' name 2013–2025

Theo is making a comeback — from #134 in 2013 to #36 in 2025.

#36 ranked in 2025

484 registrations in 2025

2,679 total 2013–2025

That's a jump of 98 positions. Registrations grew from 7 to 484 (+6814%).

Peak popularity: 2025 (484 registrations, ranked #36).

Peak 2025 · 484

Low 2013 · 7

Years tracked 12

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#36 Theo 484

How often Theo was registered in each of the 8 Australian states and territories.

Theo — popularity by state & territory in 2025. Hover a state for details, click to view the full Top 50 for that state.

Show full data table

Most popular in New South Wales (177 babies) , least popular in South Australia (33).

New South Wales

177 #32

Queensland

144 #27

Victoria

130 #50

South Australia

33 #47

Australian Capital Territory

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Northern Territory

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Tasmania

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Western Australia

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In 2025: 484 babies named Theo across 4 of 8 states and territories.

How many babies in Australia have been named Theo?: Between 2013 and 2025, Theo was registered for 2,679 babies in the available state datasets.
Is Theo a popular name in Australia?: In 2025, Theo ranked #36 among boys' names in Australia, with 484 registrations.