Ruud Strange.. I have my spouses name on my passport as well and nowhere in the app I encountered her name.
This should be something that can be resolves by support. When you don't want your spouses name in your bank statements on on your card, or you want the hyphen to be corrected, they can fix it for you I guess.
Having only a part of your spouses name is ugly and irritating, they must agree on that.
Having a similar issue with my first name, bunq insists in the app on using my full first name or just my initial. Like most people I only use a shorter version of my full legal first name.
It's not a big deal, but bunq should allow some more variants of name usage within the app and thus on cards. I know they have legal obligations, but they surely do more...