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Last name origins & meanings:

1. Czech (Kačer), Slovak (Káčer), and Jewish (Ashkenazic): from Czech kačer ‘drake’, probably applied as a nickname for someone with some fancied resemblance to a drake, or perhaps a metonymic occupational name for a poultry seller. As a Jewish surname it is mainly ornamental.
2. Hungarian (Kacér): nickname from kacér ‘immoral’, ‘narcissistic’, ‘seductive’ (from Middle High German kether, ketzer, katzer ‘heretic’, ‘sodomite’).