Btw, i am confused about filling in the forms when purchasing air tickets online. My name is "John Koh Wei Sheng", with John (my name) as my First Name, and Koh (my surname) as the Last Name. Where do i input my other two names? I am quite paranoid as i understand that many airlines insist that the name on the ticket matches the name in my passport exactly, or i will have problems at check in. So do i fill in :

First Name : John
Last Name : Koh Wei Sheng

or

First Name : Wei Sheng John
Last Name : Koh

Note : Wei Sheng is my name too, only Koh is my surname. The name in my passport is John Koh Wei Sheng.

Thanks guys, this has been bugging me for a long time. Does the order matter? Or as long as all the words in the name are there, it'll be ok. I hope i won't encounter problems at the airport