Frenchman or free man
Franciszek is the Polish form of the Latin name Franciscus. It originally denoted someone of French origin but evolved to signify a person who is free, not bound by servitude.
Less common today
Franciszek isn't in the latest US Top 1000. It last peaked at #5,840 in 2017.
Renowned Polish actor of stage and screen
Cardinal of the Roman Catholic Church and Archbishop of Kraków
Polish football player and national team manager
Celebrated Polish aviator and winner of the Challenge 1932
US births per 5-year period, 1990–present (SSA data).