I also see this as a problem.
In the customer section and in the associated link to mailchimp, the name of the buyer is empty. So looking at customers this is a email address and empty name. That's really weird to have in the customer list.
Why is the shipping address Name not used in this case instead of the billing name. I suppose you could ship it it to someone else. In which case, why does squarespace not at least use the billing form as a way to collect the actual user. Right now I just have incomplete user data.