QuarlesvanUfford (also: Quarles or Quarles de Quarles, stemming from Quarles) is the name of a Dutch family of English descent whose members have belonged to Dutch nobility since 1815.
The QuarlesvanUfford family is Dutch nobility, and Willem wanted Hendrik to find and marry a woman of similar rank. Netje, who had been born in Semarang, was an orphan from a non-noble Dutch family.