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English word vulgar comes from Latvian *welh₂, and later Latin vulgaris (Common, usual, commonly known. Simple, plain.)
*welh₂ (Latvian)
*wel (Proto-Indo-European)
to wish, desire, want
vulgus (Latin)
(uncountable) the common people. (uncountable) the public. Gathering. Throng, crowd.
vulgaris (Latin)
Common, usual, commonly known. Simple, plain.
vulgar (English)
(classicism) A common, ordinary person. (classical sense) Having to do with ordinary, common people.. Debased, uncouth, distasteful, obscene.