My thoughts on this:harsh62 said:REPOSTING TO GET A WELL EXPLAINED ANSWER
1. I think even before you change your name on passport, you need to change your name legally, only then it will be changed on the passport. Not only that, you may have to change the name on lot of official documents.
2. What is the issue with your current name? If you dont have a surname, you dont have. I dont see any issue with it as far as my international experience is concerned.
I believe it is a lengthy legal process involving lot of hassles, might delay your future visa process.
You can take opinions from few others who have experience in this.