Why Would Someone Want To Change

There are different reasons. Some change because they don't like their names much. Some change feeling their name is very old or cultural. Some change at the time when they change their religion. There are lot of reasons.

Someone would like to change their name the way I do.
Many people experience changes in life.
Those reasons can include cultural activities, the types of friends you hang with, to stay modern and there are may other reasons.

I have changed my name several times because of security sakes. So you see there are many reasons why a person would want to change their name.

Whenever I reach a new level of accomplishment and reach a new level, I like to change my avatar, maybe they are challenging themselves to compare scores.

Could also be that they have rethought their reason for a silly name and would like something a bit more proper.