NameCensus.

UK boy's name

Onni

A Finnish masculine name meaning "good fortune" or "happiness".

For 2026, the newest official UK baby-name figures on this page are from 2024. That release is the current official benchmark rather than a forecast.

Onni is a boy's name in the UK records. People looking for Onni popularity in 2026 should use the latest official release, which is 2024 in this profile. In that release it ranked #3254, with 6 babies registered with the name. Its strongest year in the published records was 2022, with 6 births.

This profile covers 21 England and Wales registrations across 5 recorded years from 1999 to 2024. The figures come from ONS England and Wales, so the page is a view of published baby-name registrations rather than a forecast or a live count of people using the name today.

The latest count is about 100% of the recorded peak, which gives a quick read on how the name has moved since its high point.

We estimate that about 21 living people in the UK are called Onni. This uses published birth registrations from England and Wales, Scotland and Northern Ireland, then applies ONS national life tables to estimate how many are likely still alive. It does not forecast extra births for 2025 or 2026.

Key insights

  • Onni ranked #3254 for boys in England and Wales in 2024, with 6 registrations.
  • The name peaked in 2022, when 6 boys were registered as Onni.
  • About 21 living people in the UK are estimated to have Onni as a first name, after adjusting past birth registrations with ONS life tables.

Latest rank (E&W)

#3254

2024

Births in 2024

6

Latest year

Peak year

2022

6 births

Estimated living

21

2026

Meaning

What does Onni mean?

The name Onni originates from the Finnish language and has its roots in the word "onni," which means "luck" or "fortune." This name has been in use since the Middle Ages in Finland and other Scandinavian countries.

It is believed that the name Onni was derived from the Old Norse word "auðna," which also means "luck" or "good fortune." The name may have been given to children as a way to wish them a prosperous and fortunate life.

One of the earliest recorded instances of the name Onni can be found in the medieval Kalevala, the national epic of Finland. In this epic poem, Onni is mentioned as the personification of good luck and fortune.

Throughout history, there have been several notable individuals with the name Onni. One of the most famous was Onni Okkonen (1899-1988), a Finnish artist and painter known for his landscapes and depictions of Finnish rural life.

Another prominent figure was Onni Pellikka (1900-1992), a Finnish long-distance runner who won the gold medal in the 10,000 meters event at the 1924 Summer Olympics in Paris.

Onni Kokko (1899-1967) was a Finnish writer and poet who is considered one of the pioneers of modern Finnish literature. His works explored themes of love, nature, and the human condition.

Onni Sihvonen (1905-1996) was a Finnish cross-country skier who won two gold medals at the 1936 Winter Olympics in Garmisch-Partenkirchen, Germany.

Onni Nikula (1899-1984) was a Finnish architect and designer who played a significant role in shaping the modernist architectural style in Finland during the mid-20th century.

While the name Onni has its origins in Finnish culture, it has also been adopted and used in other parts of the world, particularly in Scandinavia and other Nordic countries, as well as in some English-speaking regions.

Sourced from namecensus.com.

Popularity

Onni over time

The chart below shows babies named Onni registered in England and Wales in the years where the name appears in the published records, from 1999 to 2024. Empty years are left out so rare names are not stretched across long periods where the published files do not show any registrations.

For Onni, the clearest high point is 2022. The latest England and Wales figure is 6 births in 2024, compared with 6 at the peak.

Babies born per year

Onni
02356199920112024

Decades

Onni by decade

Decade totals smooth out the yearly jumps and make it easier to see whether Onni was a short-lived spike or a name that stayed in regular use. Average rank is calculated only from years where a published rank exists.

Decade Average rank Total births Years covered
2020s #3151 12 2
2010s #4675 6 2
1990s #2943 3 1

Related

Names similar to Onni

FAQ

Onni: questions and answers

How popular is the name Onni in the UK right now?

In 2024, Onni was ranked #3254 for boys in England and Wales, with 6 births registered.

When was Onni most popular?

The peak year on record was 2022, with 6 babies registered as Onni in England and Wales.

What is the meaning and origin of Onni?

A Finnish masculine name meaning "good fortune" or "happiness".

How many people are called Onni in the UK?

A total of 21 babies have been registered as Onni across the 5 years of ONS England & Wales records shown here.

Which records is this page based on?

The England and Wales timeline uses ONS baby-name records. Scotland figures come from NRS and Northern Ireland figures come from NISRA. Counts are registrations in published baby-name files. The living estimate uses those birth registrations with ONS national life tables.