query: # People with a given name that has no P31
  SELECT ?person ?personLabel ?givenname ?givennameLabel ?givennameDescription WHERE {
        ?person wdt:P735 ?givenname .
    	  FILTER NOT EXISTS { ?givenname wdt:P31 ?dummy . }
    	  FILTER NOT EXISTS { ?person wdt:P735 ?blank . FILTER ISBLANK(?blank) . }
  
        SERVICE wikibase:label { bd:serviceParam wikibase:language "en,fr" . }
  } LIMIT 30