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 parents choose Kostiantyn
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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Łódź
+279%1 in 31,680 babies
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West Pomeranian
+184%1 in 42,213 babies
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Greater Poland
+123%1 in 53,811 babies
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Łódź+279% 4 born1 in 31,680 babies+279%
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West Pomeranian+184% 2 born1 in 42,213 babies+184%
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Greater Poland+123% 4 born1 in 53,811 babies+123%
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Masovian+103% 6 born1 in 59,044 babies+103%
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Lower Silesian+53% 2 born1 in 78,567 babies+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 Kosta4
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#5540 Kostadin4
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#5541 Kostiantyn4
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#5542 Krisna4
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#5543 Kristaps4