Żaczek and Zaczek are Polish surnames. "Żaczek" is a diminutive from "żak", an archaic term for "student"
Notable people with the surnames include:
Artur Zaczek (born 1989), Polish sprinter Jarosław Żaczek (born 1967), Polish politician (1884–1945), Polish politician, statesman and lawyer , Polish actress and educator Zenobia Żaczek (born 1974), Polish activist
See also Žáček, an equivalent Czech surname Żak, Polish surname Zak (surname)