There are loads of companies having a trademark with Vanta in it and a lot of companies are also called Vanta "something". But they are in different sectors. Myself I think of the Finnish airport (Vantaa).
I'm surprised that the Chicago equity firm didn't have vanta.com registered (they're on https://vantaglobal.com).
You weren't even the first to have Vanta registered in your sector. Nvidia has that registered at one point but didn't use the name and it became "dead".
All I'm saying really is that maybe you should look at yourself before you ask someone else to change their project's name.
Call it whatever you want, just please ensure that 'to the best of your knowledge, information, and belief this product will not make it’s way into that hands of Anish Kapoor.'