The four required data files are:
/var/named/named.ca. (See "Setting Up the named.ca File" and Solaris Naming Administration Guide for additional information on the named.ca file.) So long as you are internally consistent, you can name this file anything you want.
/var/named/hosts. (See "Setting Up the hosts File" and Solaris Naming Administration Guide for additional information on hosts files.)
The name hosts is a generic name indicating the file's purpose and content. But to avoid confusion with /etc/hosts, you should name this file something other than hosts. The most common naming convention is db.domainname. Thus, the hosts file for the doc.com domain would be called db.doc.
If you have more than one zone, each zone must have its own hosts file and each of these zone hosts files must have a unique name. For example, if your DNS domain is divided into doc.com and sales.doc.com zones, you could name one hosts file db.doc and the other db.sales.
/var/named/hosts.rev. See "Setting Up the hosts.rev File" and Solaris Naming Administration Guide for additional information on the hosts.rev file.)
The name hosts.rev is a generic name indicating the file's purpose and content. If you have more than one zone, each zone must have its own hosts.rev file and each of these zone hosts.rev files must have a unique name. For example, if your DNS domain is divided into doc.com and sales.doc.com zones, you could name one hosts.rev file doc.rev and the other sales.rev.
/var/named/named.local. See "Setting Up the named.local File" and Solaris Naming Administration Guide for additional information on the named.local file.) So long as you are internally consistent, you can name this file anything you want.