Usually "Pijnacker" in Dutch sources, but still "Pynacker" in English ones. For example "Adam Pynacker" is the "preferred" spelling of Getty Union, is used by the National Gallery in Washington [1]Archived 2011-06-12 at the Wayback Machine, the Fitzwilliam in Cambridge [2]Archived 2011-06-12 at the Wayback Machine & the Courtauld in London etc.
Usually "Pijnacker" in Dutch sources, but still "Pynacker" in English ones. For example "Adam Pynacker" is the "preferred" spelling of Getty Union, is used by the National Gallery in Washington [1]Archived 2011-06-12 at the Wayback Machine, the Fitzwilliam in Cambridge [2]Archived 2011-06-12 at the Wayback Machine & the Courtauld in London etc.
Usually "Pijnacker" in Dutch sources, but still "Pynacker" in English ones. For example "Adam Pynacker" is the "preferred" spelling of Getty Union, is used by the National Gallery in Washington [1]Archived 2011-06-12 at the Wayback Machine, the Fitzwilliam in Cambridge [2]Archived 2011-06-12 at the Wayback Machine & the Courtauld in London etc.