name is not taken, but cannot be made.

[tpan]

When submitting a bug report, please use the below template and thoroughly fill out the necessary information.

Date & Time: 10/24 7pm
Frequency: All
World name: Excalibur
Character name: Matcha Nut
Retainer name: Myqenyan
NPC name:
Monster name:
Class/Level:
Party or solo:
In-game time:
Area and coordinates:
Housing:
Steps:
1. I recently transferred my character to Excalibur and wanted to make my name Honey Nut. Although no one in the server had the name, the name was unable to make.
2. Contacted customer service and was led to post a bug report here.
3.
*Add more steps if necessary

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[Enkidoh]

I'm going to suggest that is probably working as intended - the profanity filter probably regarded that name as offensive and thus why you can't create a character with that name (it could be considered rude).

So I'm sorry to say there is no way to avoid that except choose something else that doesn't have a sexual connotation to it.