Hi @jdw
how did you create this certificate? Do you use a tool of your hoster?
If yes, all these domains
DNS-Name: bluvuz.com
DNS-Name: bluvuz.siestasunvillas.com
DNS-Name: mail.bluvuz.com
DNS-Name: mail.siestasunsetvillas.com
DNS-Name: mail.siestasunvillas.com
DNS-Name: mail.suncoastaerials.com
DNS-Name: siestasunsetvillas.com
DNS-Name: siestasunsetvillas.siestasunvillas.com
DNS-Name: siestasunvillas.com
DNS-Name: suncoastaerials.com
DNS-Name: suncoastaerials.siestasunvillas.com
DNS-Name: www.bluvuz.com
DNS-Name: www.bluvuz.siestasunvillas.com
DNS-Name: www.siestasunsetvillas.com
DNS-Name: www.siestasunsetvillas.siestasunvillas.com
DNS-Name: www.siestasunvillas.com
DNS-Name: www.suncoastaerials.com
DNS-Name: www.suncoastaerials.siestasunvillas.com
are your domains? If yes, then it looks that the tool of your hoster orders the names alphabetical - and the first domain name is the CommonName.
So you can't change that if you use the tool of your hoster.