My Facebook name is Raihan Khalil. But I want to make it just Raihan. I tried but can't do it. Facebook requires you to have a first and last name. I've seen some people on Facebook with just a single name, how can I do that?
In Indonesia, Facebook allows people to keep their name limited to one word because Indonesia has a mononymic (single name) system. For more info see: https://en.wikipedia.org/wiki/Indonesian_names#Mononymic_names.
Most Indonesians don't have surnames (family names) so Facebook allows people in that country to use a single name. You can trick Facebook into thinking you live in Indonesia by using a web proxy based in that country, then try changing your Facebook name to a single name, and it should work ok. Full instructions on how to do it are here: http://www.safetricks.com/2012/10/Make-Facebook-Account-With-Single-Name.html