Family name origins & meanings
- Polish (Kwaśniewski) : habitational name for someone from Kwaśno in Płock voivodeship or Kwaśniów in Katowice voivodeship, named with kwaśny ‘sour’, probably referring to the quality of the soil.
- Polish (Kwaśniewski) : possibly a derivative of kwaśny as an unflattering nickname for a sour-faced man.