Someone made a list of many (all?) of the names that show up in Mirage, including kanji and kana. It can be found here.
After some poking I still have yet to find a reference to Tooyama Yasuhide that isn't off of a Mirage site. I'm trying to figure out if he really didn't exist, or if he's one of the incredibly obscure historical figures. (Like, ironically, Naoe Nobutsuna. Kuwabara-sensei says that he existed, but that it's kinda hard to find any references to him. She ain't wrong.)