The name was originally a diminutive form of Konrad and has been used as an independent given name since at least the 18th-century.
Kurt and Curt has experienced prevalent usage in English-speaking countries, particularly in the United States. The highest it ranked was in 1964, when it came in as the 109th most popular male name. As of 2010, it does not appear in the U.S. top 1000.
It has recently been brought to the attention through the Fox series, Glee being the name of one of its protagonists, Kurt Hummel.
Kurt is currently the 246th most popular male name in Germany, (2011). Another spelling is Curt.
Kurt is also occasionally used in the Czech Republic.
Coincidentally, the name is also used in Turkey, being from the Turkish word for wolf. Its Turkmen cognate is Gurt and its Bashkir is Kort.