When I joined the forum I didn’t know it was practically impossible to change your display name and wish I had chosen something different. I have only seen members that are high ranking and have a lot of trust have their name change approved so I’ve never bothered to send a request. I also don’t think disliking your name would be considered a valid reason.
Some people here have nickname and I have been looking for how to set my own in my profile but there is no option to set it and also there is no option to change your name in the profile settings so I think that to be able to change any of them one of the forum administrator needs to do it.
But is there any need to change your name apart from when you want to add a nickname ? Because it will not make a big difference since it's almost the same thing and people already know you with the former name.