You can get any lawyer and do a deed poll to change your name
officially.
Once done, take the deed poll cert to ICA and change your
IC.
The deed poll cost about $100 plus, depends on which lawyer u
get and yr relationship with him. Some can even do it for free.
People change name for different reasons. Some for luck which is
my case. Some find it oddward, Some to avoid debtors or
whatever.
But whatever the reason, it's rather normal to change name
nowadays. I did it three times over the year.
Btw, you dun need a reason to change your name. But as for
surname... seldom heard off, unless maybe u want a clean break from
your family or whatever. Know of one case where the father was
given away to another family and after the adopted grand parent
passed on, the whole family change their surname from "Tan" to
"Guo"