For those who don't know, "GuuRinPa" (ぐ～りんぱ, "GuuRinPa") was chosen as the trio's name when they were hosting Uraraji radio broadcasts for the series. The name is a combination of one character each from the hosts' last names: "Guu" (宮, "Guu") from Komiya (小宮, Komiya, after Dia's seiyuu, Komiya Arisa), "Rin" (林, "Rin") from Kobayashi (小林, Kobayashi, after Yoshiko's seiyuu, Kobayashi Aika), and "Ha" (波, "Ha") from Inami (伊波, Inami, after Chika's seiyuu, Inami Anju), forming "GuuRinPa".

Thank you. That was going to bother me until I saw your explanation.