Rune pages as a rule are named by the stats they provide in Red/Yellow/Blue/Quint order. For Example: Ap/AR/MR/AP. If i have room, I will give the page a short nickname either before or after this stat breakdown.
Of course, there are exceptions that prove the rule: My support runes are "AD Caster Support" "Tank Support" & "AP Support." I have a runepage that's just for Kayle that's just named "Kayle." I have a runepage for Jungle Morg (R.I.P. Spellvamp working with smite) that I don't have the heart to take apart and turn into something else just yet. I have a jungler page that I just call "Mix-up Jungle" because it provides a bunch of different stats in a sort of hodge-podge that's tough to succinctly nail down into a name otherwise.
I have 10 mastery pages set up in every possible 18-12 combination (doubling up on any pages that use the ferocity tree, one for AP, one for AD). Those are named X/X/X as appropriate. Typically, I will quickly review my masteries during the lobby and make any small, champion-specific changes to a page that I feel are necessary. After that, I have a few other mastery pages that are specific to champion builds I commonly play, and a couple for support.