Amongst my dutch ancestors there was also a William Henderson born around 1725 in Auldearn.
No dutch genealogist (several descendants) have been able to find his birth or parents. There seems to be a theory that he may be from Auchterarder (under Perth), but no one knows
Who can help us dutchies. William was spotted for the first time in Breda in 1748, so perhaps as a catholic he fled after the battle of Culloden 1746???? greetings Helma