Saddle
Old English sadol, sadul, of Germanic origin; related to Dutch zadel and German Sattel, perhaps from an Indo-European root shared by Latin sella ‘seat’ and sit.
wiktionary
From Middle English sadel, from Old English sadol, from Proto-Germanic *sadulaz, from Proto-Indo-European *sod-dʰlo-, from Proto-Indo-European *sed-(“to sit”) + *-dʰlom(instrumental suffix). Cognate with Scots sadil, Saterland Frisian Soadel, West Frisian seal, Dutch zadel, Low German Sadel, German Sattel, Danish sadel, Swedish sadel, Icelandic söðull, Russian седло́(sedló).
From Middle English sadelen, from Old English sadolian, from Proto-Germanic *sadulōną.
etymonline
saddle (n.)
Old English sadol "seat for a rider," from Proto-Germanic *sathulaz (source also of Old Norse söðull, Old Frisian sadel, Dutch zadel, zaal, German Sattel "saddle"), from PIE root *sed- (1) "to sit" + Germanic suffix *-þra, used to form neutral names of tools. Figurative phrase in the saddle "in an active position of management" is attested from 1650s. Saddle stitch (n.) was originally in bookbinding (1887).
saddle (v.)
Old English sadolian "to put a riding saddle on;" see saddle (n.). The meaning "to load with a burden" is first recorded 1690s. Related: Saddled; saddling.