If you can’t find the person you’re looking for, try searching without the last name. Before 1811, last names were not fixed in many parts of the country. People may appear in records using farm names (in the eastern part of the country) or patronymics (everywhere else), or even under a different last name. By searching for other characteristics, such as the first name of the person you’re looking for and their father’s first name, you may find people even if they’re hiding under a different name.
An example of a person who appears with and without a last name is Petronella van Vlijmen, whose baptism was found as Petronella, daughter of Hugo Dircken and Joanna, spouses.