Boekhoorn's long term girlfriend Denise this year accepted van der Garde's marriage proposal.
And van der Garde, who is sponsored by the Boekhoorn-linked Dutch fashion label McGregor, and managed by its chief, could be looking for a new seat for 2014, amid rumours former team driver Heikki Kovalainen is returning to Caterham.
Van der Garde's manager Jan Paul ten Hoopen commented: "Marcel would only consider such a step from a responsible business perspective."
He confirmed that Boekhoorn and Wolff, now a co-owner and director at Mercedes, have "talked to each other".
But when asked if the deal would pave the way to Williams for van der Garde, manager Hoopen insisted: "Basically, buying shares and getting a race seat are distinct."
However, while refusing to rule out taking McGregor back to Williams as a sponsor, he added: "Giedo would like to drive for a renowned team, and I think Williams knows what it is doing."
Williams already has a Dutch shareholder in the form of the investment firm Cyrte, founded by billionaire John de Mol, who own a 5 per cent stake.