Perhaps from qadam in the sense of striking upon; an axe -- ax.
see HEBREW qadam
H7134. qardom
[קַרְדֹּם] noun [masculine] axe (√ unknown; compare Late Hebrew קַרְדֹּם double hoe,one side of which could split wood, VogelstLand writhsch.37; Arabic , adze is loan-word according to Frä84); — suffix קַרְדֻמּוֺ 1 Samuel 13:20 + Judges 9:48 (so probably read for הַקַּרְדֻּמוֺתּ, A ᵐ5L τ. ἀξίνημ, GFM Bu Now); plural קַרְדֻּמִּים 1 Samuel 13:21, קַרְדֻּמוֺת Jeremiah 46:22; Psalm 74:5