Wikipedia
Krzysztof
Krzysztof is a Polish given name, equivalent to English " Christopher". The name became popular in the 15th century. Its diminutive forms include Krzyś, Krzysiek, and Krzysio.
Individuals named Krzysztof may choose to celebrate their name day on March 15, July 25, March 2, May 21, August 20 or October 31.