The next page explains "Roiyal," but I added engrish for "Memu" under the assumption that isn't the same deal.
Yeah, Menyuu/Menyu/Menew or something would be from the katakana /menyuu/. There's not really anyway to get Memu from it. Unless it was taken from 'Memo'?
Silent MangaLet's all imagine what kind of conversation they had!
Next page has an example!