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All I know is that it's Czech. Anyone with more information, please edit.
Žáček means "small school boy" in Czech. A famous bearer is Chicagoan writer Dennis Začek.
Feminine form of Zelníček
, this is the maiden name of Donald J. Trump's first wife, Ivana Zelníčková Trump
According to my translator, it means "tooth", so my guess is that it's an occupational surname for someone who's a dentist; the word for dentist is 'zubař.'