Find Luxembourgish citizens on Wikidata without a family name

luxembourgish_citizen_without_familyname.sparql

PREFIX schema: <http://schema.org/>
PREFIX wd: <http://www.wikidata.org/entity/>
PREFIX wdt: <http://www.wikidata.org/prop/direct/>

SELECT DISTINCT ?human ?humanLabel (group_concat(?givennameLabel;separator=', ') as ?givenNames)
WHERE
{
  ?human wdt:P31 wd:Q5 ;
         wdt:P27 wd:Q32 .
  ?human wdt:P735 ?givenname .
  FILTER NOT EXISTS {
    ?human wdt:P734 ?familyName    
  }
  FILTER NOT EXISTS {
    ?human wdt:P97 ?nobility #Excludes nobility from the result set
  }
  OPTIONAL {
    ?human schema:isPartOf <https://lb.wikipedia.org/> .
  }
  SERVICE wikibase:label {
    bd:serviceParam wikibase:language "lb,fr,de,en".
    ?human rdfs:label ?humanLabel.
    ?givenname rdfs:label ?givennameLabel.
  }
}
GROUP BY ?human ?humanLabel