I read your message on the internet. There are many Duijndam. Living in the surroundings of Monster, Delft but also Noordwijk, which is a small village (25000 inhabitants) some 35 kilometers from Monster.
The oldest Duijndam i've got is Joost Duijndam, born in Monster 18-12-1744. He died in Voorschoten 05-11-1808 in Voorschoten and was burried there.
Do you think there is a link ?