Kostiantyn
The Ukrainian spelling of Konstanty, from the Greek for "constant, steadfast". It barely appeared in Poland before the 2020s, and only ever for boys: meeting one is still memorable.
Kostiantyn Pronunciation
Kostiantyn is pronounced kost-YAHN-tihn (/kɔstˈjantɨn/).
What Kostiantyn means
Where Kostiantyn comes from and what it has meant to the people who carry it.
Kostiantyn is the Ukrainian form of the Greek name Konstantinos, and its sense sits close to its surface: constant, steadfast. The Greek passed east with the church, and Ukrainian kept it in this shape while Polish reworked the same root into Konstanty. The root does not bend. Both point back to one idea, a person who holds.
In Poland the name keeps a small family around it. Konstanty is the everyday variant, Kostek the diminutive a boy answers to at school, and Konstancja the feminine form given to a daughter. The forms differ, yet the meaning under them stays fixed.
On his imieniny the full name gets called out, Konstanty, before it folds back to Kostek by evening. Today it is rarer than Jakub, though never gone. The steadiness sits in the meaning rather than the sound: stały, wytrwały, one who stands.
How many people are named Kostiantyn
1 in 2024 men in Poland is named Kostiantyn. 10,553 people carry it in the 2025 register: rank #357 among male names.
Kostiantyn's popularity over time
9 boys were given the name in 2025, ranking #738 among newborns. It has been climbing since 2019. Still the #357 name among living men, even as it slips to #738 among newborns.
Where Kostiantyn is most popular
Kostiantyn is most popular in Łódź, 279% above the national average (4 boys born 2019–2025), followed by West Pomeranian (+184%) and Greater Poland (+123%).
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Łódź4 boys born+279%
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West Pomeranian2 boys born+184%
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Greater Poland4 boys born+123%
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Masovian6 boys born+103%
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Lower Silesian2 boys born+53%
Kostiantyn as a middle name
Kostiantyn is a first name for 10,553 men in Poland and a middle name for another 4, a 100/0 split. In the men's middle-name ranking it sits 5541st, between Kostadin (4) and Krisna (4).
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5539
4Kosta
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5540
4Kostadin
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55414Kostiantyn
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5542
4Krisna
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5543
4Kristaps