Piątek (also known as Piontek) is a surname of Polish origin that translates to "Friday." While both spellings are used within Poland, the form Piątek is approximately ten times more common than Piontek. In other countries, the spelling Piontek is sometimes preferred to ensure correct pronunciation.
In addition to its use as a personal name, Piątek serves as a toponym in Poland, indicating that it is also used as a geographical place name throughout the country.