You need to get a deed poll
done..
Actually I dun think it's necessary ba.. coz u can tell ple to call
u by that english name that u prefer.. and if u apply cards, can
always use that english name altho it's not in ur ic.. anyway, up
to u..
I think i got my deed poll done quite cheap liao.. coz most lawyers
i know charge at least $100, and i got mine at $80. However, that's
bcos my fren got connection.
After getting ur deed poll, you have to go SIR and change ur IC. On
my deed poll, it was written that i muz get my new IC done within
30 days. However, my fren called and asked and was told that it's
not necessary. Changing of IC cost $60.
If u want everything (cards, bank accounts, memberships, medical
appointment cards etc) to reflect ur english name, it's really
going to be very troublesome.
So, think twice before you decide ba.
And here is a link for getting your deed poll done
online.