Just a thought to reduce abuse of a feature, and keep the game safe. Hope it goes in the right direction:
Some mischievous characters are changing their guild name every few hours, to abuse other characters. One example is having a guild name "Character's Sweaty Balls" - I actually saw this guild (not mentioning the "character's" obviously). Another name I saw was "Characters' testicles". Both these guilds were made by the same person within a short interval, and they constitute first degree offense.
My suggestion is, implement a time delay before the guild name can be changed. For example one day, one week etc. before you can change guild name again. Optionally, a Tria fee could also be imposed (probably depending on how many members guild has, or just a lumpsum amount) to deter frequent guild name changes.
Also, guild names must pass through the same abusive text-filter that normal chat does. (I hope it's done already, still posting it just in case).
Thanks.