Boy name · Finnish
Onni
“happiness, luck”
Vibes
Explore Onni further
Similar-feel alternatives, or middle-name candidates that pair well with Onni — both ranked by the same scoring system (vibe overlap, syllable rhythm, origin compatibility).
About the name
Onni is happiness and also luck — Finnish does not separate the two the way English does, so the name means both at once and a Finnish speaker would not think to ask which.
It belongs to the wave of short old Finnish names that came back in the 2000s alongside Eino, Väinö and Otso, after a century in which Finnish parents mostly reached for Swedish and biblical forms instead.
Two syllables, said OHN-nee. The doubled n is held slightly longer, which is meaningful in Finnish and inaudible to everyone else. On our vibe map it is Modern Minimalist.
More Finnish names
Onni sits in our Finnish set — these share its roots.
All Finnish names →Onni — common questions
Is Onni a boy or girl name?
Onni is traditionally a boy name of Finnish origin.
What does the name Onni mean?
Onni means “happiness, luck” of Finnish origin. Onni is happiness and also luck — Finnish does not separate the two the way English does, so the name means both at once and a Finnish speaker would not think to ask which.
Where does the name Onni come from?
Onni is Finnish in origin. It belongs to the wave of short old Finnish names that came back in the 2000s alongside Eino, Väinö and Otso, after a century in which Finnish parents mostly reached for Swedish and biblical forms instead.
How popular is Onni?
Onni did not make the top 1,000 boys' names in US Social Security Administration data for 2025, which makes it genuinely rare in the US.
Bring the name into the room
A couple of nice things named Onni you might want for the nursery.