Using non- Muslim names


my question is that when a man chats on the internet with someone and the person on the other end asks him his name, he replies with a non-Muslim name to hide his identity, does this constitute kufr ( Note; there was no intention of Kufr) if it does constitute kufr then what has to be done? If it is just to deceive the other jokingly will it be permissible? ANSWER:
This act will not constitute to Kufr, however one should refrain from such actions.

And Allah Ta’aala knows best

Huzaifah Bin Mohammed Anwer

Attested to as correct by:
Mufti Muhammed Ashraf
17 September 2010 / 08 Shawaal 1431