Have you stated reason for name change.
Ask as he previously obtaining extensions in UT and knowing that it would complicate things why would someone change name.
It doesn't help to hide travel history to Thailand and cover up things such as overstay.
EDIT: just read the thread again.
Couple of folk have asked "reason for name change"
You did not address that.
If someone asked for my advice re that, be it a friend or bar stool ....I would ask WHY.