From Middle English willy, willi, equivalent to will + -y. Cognate with Dutch willig ("obedient, hearsome"), German willig ("willing"), Swedish villig ("willing, agreeable").
From Middle English wilȝe, from Old English wiliġ ("willow"). More at willow.
From Middle English wilie, from Old English wiliġe, wileġe, from Proto-Germanic *wiligō ("wicker basket"), from Proto-Indo-European *weliko- ("willow-tree"). More at weel, willow.
Originally northern British usage, from the 1960s. Probably the simple use of a proper name as a pet name; compare dick, fanny and peter. Unlikely to be a contraction of Latin membrum virile, male member (that is, the penis), a Latin term used in English in the nineteenth century.
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