Originally Posted by
YianKutku
Minor correction:
It's Gan'en's Tomb, for the first King of Doma. Katakana is ガンエン.
Koji Fox elaborates that Japanese players seeing it would understand the reference to 岩燕, which means "cliff swallow" (it's literally the words for rock "岩" and swallow "燕"), but read as a name. It would be difficult to localize into English, though, so he just took the "swallow" part of it, and added a reference to the feng shui compass.
(Completely unrelated tangent: I'm always puzzled by the way feng shui in the game is translated as "geomancy", which is like saying FFXIV and FFXV are the same thing. Technically not untrue, but...)