Jacek is a popular male given name of Slavic origin, particularly prevalent in Poland and other Slavic countries. It is derived from the word "jać", which means "to speak" or "to say". The name Jacek has been widely used throughout history, with notable bearers including several saints, scholars, and historical figures. While it has traditionally been more common among Slavic populations, in recent years, it has also gained some recognition internationally.
The name Jacek experienced a significant increase in popularity from the late 1980s onwards, with a notable spike starting around the year 2000. Between 2001 and 2006, there were consistently high numbers of births, peaking at 32 in 2012. However, since then, the popularity of the name has declined, with fewer than 15 births per year from 2014 onwards, reaching a low of just 5 in 2023. In total, there have been 522 boys named Jacek since 1965.