The service template in the common helm chart currently defaults the service name to the name of the chart. But you can override it with the server.name in a values.yaml.
 
In the case of a name override, you would also have to override the service name like shown below:
 

1. subchart configuration
     mariadb:
       nameOverride: clampdb
     service:
       name: clampdb
    
   The service name template should honor the chart name override.