mallet (n.)

"small wooden hammer," chiefly used for driving another tool, late 14c., from Old French maillet "mallet, small wooden hammer, door-knocker," diminutive of mail, from Latin malleus "a hammer, mallet," from Proto-Italic *molalo-, *molklo- "hammer," from PIE *molkh-tlo- "crushing instrument," source also of Russian molot, Czech mlat "hammer," from PIE root *mele- "to crush, grind." It is wielded with one hand, while the heavier mall or maul requires both.