Mummy
late Middle English (denoting a substance taken from embalmed bodies and used in medicines): from French momie, from medieval Latin mumia and Arabic mūmiyā ‘embalmed body’, perhaps from Persian mūm ‘wax’.
wiktionary
From Middle English mummie, from Anglo-Norman mumie, from Middle French momie, from Medieval Latin mumia, from Arabic مُومِيَاء (mūmiyāʾ), from Persian مومیا (mumyâ), from موم (mum, “wax”). Doublet of mumijo.
Diminutive of mum, related to mom and mommy, from mother.
etymonline
mummy (n.1)
late 14c., mummie, "medicinal substance prepared from mummy tissue," from Medieval Latin mumia, from Arabic mumiyah "embalmed body," from Persian mumiya "asphalt," from mum "wax." Sense of "dead human body embalmed and dried after the manner of the ancient Egyptians" is recorded in English from 1610s. Mummy wheat (1842), grown in Egypt and Ethiopia and once thought to be a distinct species, was said to have been cultivated from grains found in mummy-cases.
mummy (n.2)
1784, a childish alteration of mammy. Alternative form mumsy attested by 1876.
