Willow

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Old English welig, of Germanic origin; related to Dutch wilg .

wiktionary

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From Middle English wilwe, welew, variant of wilghe, from Old English weliġ, from Proto-West Germanic *wilig, from Proto-Indo-European *welik- (compare (Arcadian) Ancient Greek ἑλίκη(helíkē), Hittite 𒌑𒂖𒆪(welku, “grass”)), from *wel-(“twist, turn”).

etymonline

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willow (n.)

Old English welig "willow," from Proto-Germanic *wel- (source also of Old Saxon wilgia, Middle Dutch wilghe, Dutch wilg), probably from PIE root *wel- (3) "to turn, revolve," with derivatives referring to curved, enclosing objects. The change in form to -ow (14c.) paralleled that of bellow and fellow. The more typical Germanic word for the tree is represented by withy.