Quote Originally Posted by Squall of SeeD
Final Fantasy III (Hyne's Castle) and Final Fantasy: Tactics (mentioned as part of three of the Propositions, once with the spelling of "Yugdrasil" and the other time with the spelling of "Yugudoracil," and called "the World Tree both of these times; the third time it was just called "the World Tree"). Depending on the translation you're looking at for III, it might be called "the Elder Tree."

Also in Xenogears Barts ship is named Yggdrasil.