1650s, phonological spelling of chamois. Other bungled spellings include shambo (1610s), shamois, shamoys, shammies. Compare shay from chaise; shappo (1700) for chapeau; shapperoon (1620s) for chaperon.
shambolic
shame
shamefaced
shameful
shameless
shammy
shampoo
shamrock
shamus
shan't
shanachie