Where I can get Certificate of name change?

I got citizenship last year and i changed my name, but i didnt get the certificate of name change at that time.
Does anyone know where/how i can get it?

Answer:
Write to the Home Office, if you are in UK, giving all your details and explaining the situation.

http://www.homeoffice.gov.uk/
if you`re in the US then you gotta go to your local INS office,apply and wait about a week

The immigration information post by website user , MyTend.com not guarantee correctness

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