Probably from the base of harpazo; fruit (as plucked), literally or figuratively -- fruit.
see GREEK harpazo
καρπὸν (karpon) − 38 Occurrences
καρπὸς (karpos) − 8 Occurrences
καρποῦ (karpou) − 4 Occurrences
καρποὺς (karpous) − 10 Occurrences
καρπῶν (karpōn) − 6 Occurrences