Proper noun
Kostyantyn (plural Kostyantyns)
A transliteration of the Ukrainian male given name Костянтин (Kostjantýn).
Professionalism and good taste are the main features of Kostyantyn Ionenko as a musician and a leader. Source: Internet
On June 24, 2010 Ukraine's Foreign Minister Kostyantyn Hryshchenko signed an agreement on free trade with the European Free Trade Association (EFTA). Source: Internet