Only the owner of yyy.name can do those kind of transfers.
Your xxx.yyy.name is a subdomain of yyy.name and thus beholden to it. Unless it's something like a .co.uk domain, which with you mentioning .name isn't the case.
Your xxx.yyy.name is a subdomain of yyy.name and thus beholden to it. Unless it's something like a .co.uk domain, which with you mentioning .name isn't the case.