In all the world, Stempień (Stempień 
) is an extremely rare unknown gender forename. Much more prevalently, Stempień is the last name as well as the forename.
Ewa, Emilka, Witold, Wiktor, Mariusz, Martyna, Mateusz, Michał, Barbara, Bartosz, Tomasz, Paulina, Justyna, Karolina, Dominika, Grzegorz, Magdalena, Agnieszka, Bartłomiej, Katarzyna, Krzysztof, Roksana, Joanna, Dorota, Damian, Mike, Anna, Adam, Asia, Irek, Marta, Marek, Magda, Aneta, Artur, Paweł, Piotr, Rafał, Irena, Marcin, Monika, Bartek, Kamila, Konrad, Patryk, Daniel, Aleksandra, and Małgorzata