Lewis

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late Middle English: probably from Old French lous, plural of lou(p ) ‘wolf’, the name of a kind of siege engine.

wiktionary

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From Middle English lewis, of uncertain origin. Possibly from Old French lous, plural of lou, loup(“the name of a kind of siege engine”, literally “wolf”); or related to clevis.

etymonline

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Lewis

masc. proper name, Anglo-French form of French Louis (see Louis).