Question about Transferring Guilds

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I'm wondering if anyone might know if guild names are region-wide like character names are? I've been trying to look around for information because I know a lot of people are considering transferring from Mushin to another server, but may still want the guild name they chose if they are guild leader.

If they are, then great. If they aren't, then there's the possibility that someone else will have taken the name, but they could probably claim it on a mule if it hasn't been claimed already.