Origin of bain
- From Middle English bain, bayne, bayn, beyn (“direct, prompt”), from Old Norse beinn (“straight, right, favourable, advantageous, convenient, friendly, fair, keen”), from Proto-Germanic *bainaz (“straight”), from Proto-Indo-European *bhei- (“to hit, beat”). Cognate with Scots bein, bien (“in good condition, pleasant, well-to-do, cosy, well-stocked, pleasant, keen”), Icelandic beinn (“straight, direct, hospitable”), Norwegian bein (“straight, direct, easy to deal with”). See also bein.
- From Middle English bayne, baine, from Old French bain (“bath”), from Latin balneum (“bath, bath-house”).