Wealthy

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Middle English welthe, from well1 or weal2, on the pattern of health .

wiktionary

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From Middle English welthy, welþi, equivalent to wealth +‎ -y. Cognate with Middle Dutch weldech, weeldech(“magnificent, luscious, lavish”).

etymonline

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wealthy (adj.)

late 14c., "happy, prosperous," from wealth + -y (2). Meaning "rich, opulent" is from early 15c. Noun meaning "wealthy persons collectively" is from late 14c.