Mariusz
Around 285,000 Polish men carry it, a name nearly everyone has run into, yet it barely reaches the cradle now: just 30 newborns last year. At root it means "of Mars", the Roman god of war.
Mariusz Pronunciation
Mariusz is pronounced MAHR-yoosh (/ˈmarjuʂ/).
What Mariusz means
Where Mariusz comes from and what it has meant to the people who carry it.
Mariusz points back to Mars, the Roman god of war, and the name has held onto that sense of the male and the martial. The short meaning says as much: of Mars, or simply male. Strip the Polish ending and you reach Marius, the shorter variant that opens onto the same root.
For a Polish speaker the name sits in the everyday. On 19 January the calendar hands Mariusz his imieniny. A boy named Mariusz answers the register in a Warsaw classroom, one of several in his year, rarely the only one.
The war-god sense was never a promise about the boy. It is a thread of meaning the name inherited, older than any bearer. What stays true is small and checkable. Mariusz means of Mars, its shorter form is Marius, and its name-day falls on 19 January.
When Mariusz celebrates name day
Mariusz appears 6 times in the Polish name day calendar, 2 of them as a main name, the first on 19 January.
The days Polish calendars list this name on. By custom you celebrate one of them, usually the first after your birthday.
Rarer dates. Only the most complete calendars add this name on these days. Most skip them, so hardly anyone celebrates then.
How many people are named Mariusz
1 in 75 men in Poland is named Mariusz. 285,311 people carry it in the 2025 register: rank #37 among male names.
Mariusz's popularity over time
30 boys were given the name in 2025, ranking #441 among newborns. It has been falling steadily since 2000. Still the #37 name among living men, even as it slips to #441 among newborns.
Where Mariusz is most popular
Mariusz is most popular in Opole, 137% above the national average (16 boys born 2019–2025), followed by Pomeranian (+67%) and Kuyavian-Pomeranian (+56%). It is least common in Subcarpathian and Lublin, 83% and 60% below average respectively.
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Opole16 boys born+137%
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Pomeranian36 boys born+67%
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Kuyavian-Pomeranian25 boys born+56%
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Warmian-Masurian16 boys born+52%
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Podlaskie14 boys born+45%
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Silesian43 boys born+29%
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Łódź23 boys born+24%
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West Pomeranian15 boys born+21%
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Lubusz7 boys born−4%
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Lower Silesian22 boys born−5%
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Greater Poland26 boys born−18%
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Lesser Poland24 boys born−28%
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Masovian37 boys born−29%
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Świętokrzyskie4 boys born−51%
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Lublin6 boys born−60%
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Subcarpathian3 boys born−83%
Mariusz as a middle name
Mariusz is a first name for 285,311 men in Poland and a middle name for another 98,841, a 74/26 split. In the men's middle-name ranking it sits 33rd, between Władysław (100,059) and Rafał (97,261).
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#31 Karol105,522
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#32 Władysław100,059
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#33 Mariusz98,841
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#34 Rafał97,261
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#35 Dariusz89,939