I’m hoping this is the correct place to report this. I was re-reading over the naming rules (https://us.battle.net/support/en/article/34530) and noticed:
Pet Naming Rules
Spaces can only be used in companion pet names, and all initial letters are capitalized automatically.
Since rare pets now retain their names, you can have a hunter pet that has spaces in it, this should probably be noted or updated. Thanks!