Konstancjusz / Constantius / Constantin / Constantine / Konstantin

Konstancjusz is the Polish form of the Roman cognomen 'Constantius', which itself is derived from the Latin word 'constans', meaning 'constant' or 'steadfast'. The name gained prominence through several Roman emperors, most notably Constantius I Chlorus, father of Constantine the Great. Its usage spread throughout Europe with the influence of the Roman Empire and later, Christianity.

In Poland, the name has been used historically, particularly among nobility and clergy, reflecting its Latin and Christian roots. While not as common as some other traditional Polish names, it has maintained a presence, often in its longer, more formal form, emphasizing its classical heritage.