User blog comment:Jopjopjop/SlashDog/@comment-181.131.134.127-20150310212758/@comment-73.178.133.185-20150310220522

You only really needed the first link. The fifth sacred beast, Huanglong of the center was added when the Four Symbols were linked to the Chinese Five Elements. For the Five Great Head Families, the names of their governoring Sacred Beast is essentially a title given to the strongest among them who inherits their Sacred Beast. The Vietnamese Four Holy Beasts you linked to are a different, lesser group of beasts. Otherwise the names are the same but simply differ due to the different pronunciation of kanji. For the sake of separating the Sacred Beast from the person with the same name, I've personally decided to use the Chinese name for the Sacred Beast in spite of the fact that the Five Families are purely Japanes.