Steps to make single name Facebook I’d :
1.Open your facebook account
2.Change language into Tamil
3.Go to Setting<General<Name
4.Remove last name and save it your single name fb account done
5.Go to language and angain change language English or other which you want
You use facebook daily so you have ecprience to understand where is setting general name etc when you language change if you face difficulties understand language so open another fb account diffrent browser and where is setting general and etc hope you like my post thank you.