Technically, these are NOT called rule names, but descriptions instead.

The description of my firewall rules (on LAN is where I'm logging) are in my firewall logs. If you've got no rules created, you'll have to make some that actually log the data. After that, if you look in Status -> System Logs -> Firewall in the Rule column it lists the rule description(s).

There's also the 10 digit unique (I think) tracking ID code to make them quick to find or index.

The only restriction listed for rule descriptions is max of 52 characters. Don't know anything about special characters, however. Here's some talk about some description stuff.

https://forum.netgate.com/topic/92254/firewall-rule-description-length-limitation

Jeff