i don't know if there is a link between wassenar and wassner but I have some information about ancestors from netherland (i'm from france).
They lived in Stochland, onderdendom, middelstam, vendam
(groningen). I had a trace of :
- albert jacob wassner,
- gurt wassner,
- jacob albert wassner
during the period 1762-1829
If you have some information about that I would appreciate.