Hi I am looking for advice.

I have a 4th Great Grandfather who as far as I can tell from the Census records of England was born in the Isle of Man. He is John Chesterman B 1838 Castletown IOM. The only information I can locate is a christing record for John Higgins B 1838 mother Catherine Higgins. He is then shown on the Isle of Man Census as living with grandparents but as John Chesterman. How do I obtain the birth Certifcate with having the two names? Is it likely he was registered as John Chesterman?
Any help most appreciated.

Sharon