The name was originally a diminutive form of the Latin male name Constans, but due to the fame and notoriety of Constantine the Great, the name exclusively became an independent given name in the beginning of the Middle Ages.
Currently, its German form of Konstantin is the 39th most popular male name in Austria, (2010) and the 60th most popular in Germany, (2011).
Other forms of the name include:
Kostandianos Կոստանդիանոս (Armenian)
Konstantin Константин (Bulgarian/Croatian/Czech/Finnish/German/Hungarian/Macedonian/Plattdeutsch/Russian/Scandinavian/Serbian/Slovene)
Constantinos Κωνσταντινος (Greek)
Kostyantyn остянтин (Ukrainian)
Common Russian diminutives are Kosta and Kostya.
Feminine forms include:
Konstantina Константина Κωνσταντίνα (Bulgarian/Croatian/Czech/Greek/Macedonian/Hungarian/Russian/Serbian/Slovene)
Meaning: “constant; steadfast.” Eng (KAHN-stənts); Fre (kawn-STAWNS)
The name is an anglicized form of the Late Latin female name Constantia which is a feminine form of Constantius derived from the Latin constans meaning “steadfast; constant.”
The name was very common throughout Medieval Europe and was borne by several European royals. In the English-speaking world it was notably the daughter of William the Conqueror who actually introduced the name to England.
Its Spanish form of Constanza is currently the 11th most popular female name in Chile, (2010), while Constance was the 131st most popular female name in France, (2009).