From Middle English welth, welthe, weolthe, from Old English *welþ, weleþu, from Proto-West Germanic *waliþu.
Alternatively, possibly an alteration (due to similar words in -th: compare helth, derth) of wele, from Old English wela, from Proto-Germanic *walô, from Proto-Indo-European *wel-; equivalent to weal + -th. Cognate with Dutch weelde, Low German weelde, Old High German welida, welitha. Related also to German Wohl, Danish vel, Swedish väl. More at weal, well.
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