Will
Old English wyllan, of Germanic origin; related to Dutch willen, German wollen, from an Indo-European root shared by Latin velle ‘will, wish’.
wiktionary
From Middle English willen, wullen, wollen, from Old English willan(“to want”), from Proto-West Germanic *willjan, from Proto-Germanic *wiljaną, from Proto-Indo-European *welh₁-(“to choose, wish”).
Cognate with Dutch willen, Low German willen, German wollen, Swedish and Norwegian Nynorsk vilja, Norwegian Bokmål ville, Latin velle(“wish”, verb) and Albanian vel(“to satisfy, be stuffed”). The verb is not always distinguishable from Etymology 3, below.
From Middle English wille, from Old English willa(“mind, will, determination, purpose, desire, wish, request, joy, delight, pleasure”) (compare verb willian), from Proto-Germanic *wiljô(“desire, will”), from Proto-Indo-European *welh₁-(“to choose, wish”). Cognate with Dutch wil, German Wille, Swedish vilja, Norwegian vilje.
From Middle English willen, from Old English willian(“to will”), from Proto-West Germanic *willjōn(“to will”), from Proto-Indo-European *welh₁-(“to choose, wish”). Cognate with German Low German willen, German willen. The verb is not always distinguishable from Etymology 1, above.
etymonline
will (v.1)
Old English *willan, wyllan "to wish, desire; be willing; be used to; be about to" (past tense wolde), from Proto-Germanic *willjan (source also of Old Saxon willian, Old Norse vilja, Old Frisian willa, Dutch willen, Old High German wellan, German wollen, Gothic wiljan "to will, wish, desire," Gothic waljan "to choose").
The Germanic words are from PIE root *wel- (2) "to wish, will" (source also of Sanskrit vrnoti "chooses, prefers," varyah "to be chosen, eligible, excellent," varanam "choosing;" Avestan verenav- "to wish, will, choose;" Greek elpis "hope;" Latin volo, velle "to wish, will, desire;" Old Church Slavonic voljo, voliti "to will," veljo, veleti "to command;" Lithuanian velyti "to wish, favor," pa-velmi "I will," viliuos "I hope;" Welsh gwell "better").
Compare also Old English wel "well," literally "according to one's wish;" wela "well-being, riches." The use as a future auxiliary was already developing in Old English. The implication of intention or volition distinguishes it from shall, which expresses or implies obligation or necessity. Contracted forms, especially after pronouns, began to appear 16c., as in sheele for "she will." In early use often -ile to preserve pronunciation. The form with an apostrophe ('ll) is from 17c.
will (n.)
Old English will, willa "mind, determination, purpose; desire, wish, request; joy, delight," from Proto-Germanic *wiljon- (source also of Old Saxon willio, Old Norse vili, Old Frisian willa, Dutch wil, Old High German willio, German Wille, Gothic wilja "will"), related to *willan "to wish" (see will (v.1)). The meaning "written document expressing a person's wishes about disposition of property after death" is first recorded late 14c.
will (v.2)
Old English willian "to determine by act of choice," from will (n.). From mid-15c. as "dispose of by will or testament." Often difficult to distinguish from will (v.1).
