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Russian word молодец comes from Russian молодо́й, Russian -ец
молодо́й (Russian)
-ец (Russian)
-er, -an (nominal suffix for agent nouns or nouns designating persons).
молодец (Russian)
Attaboy, attagirl. Fine fellow, fine girl Attaboy!, attagirl!, well done! Brave man, clever man (usually a young man).