Changing Alphanumeric case for username

Hi. Using 7.3.1.

I had a user create a username of:

• example

but he'd prefer it to be:

• Example

ie. with a capital letter at the start.

Is there any way to do this for him, if he can't do it himself?

It's better to not change username at all, some urls are generated using the username fields and if it's changed then some URLs could start working incorrectly. 

If user has no content at all, then it's fine to change it, you can drag username fields for admin in profile edit form in profile fields builder.