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This doesn't seem like an etymological possibility for the name to mean "from the little lane." In French that would be De la petite voie. That has nothing to do with the name Lanette. It is likely that the baby name book made up the meaning, especially to coincide with popular interest of the time period. The same thing happens today in which people make up meanings for names instead of using etymology.

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I think you will find that Lanette, Lynette, Linnet and all of its other variants are variations of Luned. See here: https://www.behindthename.com/name/lynette