User blog:Kir the Wizard/Universes' name spellings

Are we sure we are using correct names for alternate universes? I noticed that DC Database uses names with dashes when describing Arrowverse's Earths, but I thought that it might be their own mistake. But then I see that episode names themselves use the dashes, like "Welcome to Earth-2", "Escape from Earth-2", rather than "Earth Two" like on the wiki right now. Should we change it?