${url} is "canonical name", not ${name}.

modules/wordpress/manifests/init.pp

@@ -119,8 +119,8 @@ define wordpress (
           redirect_dest     => "https://${name}/",
           before            => Letsencrypt::Certonly[$url],
           access_log_format => '%h %u %t %m %H://%v/%U%q %>s %b',
-          access_log_file   => "${name}_access.log",
-          error_log_file    => "${name}_error.log",
+          access_log_file   => "${url}_access.log",
+          error_log_file    => "${url}_error.log",
         }
 
         apache::vhost { "${name}_ssl":
@@ -133,8 +133,8 @@ define wordpress (
           ssl_key           => "/etc/letsencrypt/live/${url}/privkey.pem",
           require           => Letsencrypt::Certonly[$url],
           access_log_format => '%h %u %t %m %H://%v/%U%q %>s %b',
-          access_log_file   => "${name}_access.log",
-          error_log_file    => "${name}_error.log",
+          access_log_file   => "${url}_access.log",
+          error_log_file    => "${url}_error.log",
         }
       }
     }