A form of illogicalargument asserting that two things are related because they have opposite significations.
Wiktionary
Origin of Lucus A Non Lucendo
Latin LUCUS A NON LUCENDO LUCUS A NON LUCENDO lucus anon lucendo , literally "a grove from not shining", referring to an ancient grammarian's assertion that Latin lucus (“grove") derived from luceo (“I shine"), because groves were dark places.