The Ancient Urn is one of the 20 different lesser Treasures of Tokuno that can be found on most creatures in the Tokuno Islands during Publish 30 to 32.
If you gather 10 of the lesser treasures, you can turn them in to the Minister of Trade in Zento during publish 31 and 32. The minister will then give you an item of greater power.
The Ancient Urn comes with one of 35 randomly selected names. The list of possible names is Akira, Avaniaga, Aya, Chie, Emiko, Fumiyo, Gennai, Gennosuke, Genjo, Hamato, Harumi, Ikuyo, Juri, Kaori, Kaoru, Kiyomori, Mayako, Motoki,
Musashi, Nami, Nobukazu, Roku, Romi, Ryo, Sanzo, Sakamae, Satoshi, Takamori, Takuro, Teruyo, Toshiro, Yago, Yeijiro, Yoshi, Zeshin.