The name Lesley is the feminine variation of Leslie which is the masculine version. Americans in the 1940s mistakenly thought the version of Lesley was masculine. I believe it was categorized as such after a movie character. Nevertheless, the name Leslie is the masculine version. The name Lesley in Europe and in the U.K. would be named for a woman.
― Anonymous User 10/29/2020
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This is the feminine spelling in the UK, while Leslie is the masculine one.