late 14c., pamperen, "to cram with food, indulge with food," probably from a Low German source such as Middle Dutch (compare West Flemish pamperen "cram with food, overindulge;" dialectal German pampen "to cram"), probably from a frequentative of the root of pap (n.1). Meaning "treat luxuriously, overindulge" (transitive) is attested by 1520s. Related: Pampered; pampering.
<a href="https://www.etymonline.com/word/Pampered">Etymology of Pampered by etymonline</a>
Harper, D. (n.d.). Etymology of Pampered. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/Pampered