Is there any religious or mythological significance to the word "Acorah"?

Derek Acorah is a psychic, so I think that no,.
https://en.wikipedia.org/wiki/Derek_Acorah

I'm also assuming that you are asking after Derek Johnson/Acorah who claims "Acorah" was a family name.

"Our family name was Johnson but I always felt mine should be Acorah. That was my gran's name when she was married to her first husband, who was a sailor born in the Netherlands. Gran said the name was favourable in numerology, relating to the Sun and the beginning of all things."


The Psychic World of Derek Acorah, by John Sutton and Derek Acorah.


https://www.abebooks.co.uk/servlet/BookDetailsPL?bi=20920439535&tab=1&searchurl=sortby%3D17%26an%3DSUTTON%252C%2BJOHN%2B

Derek Acorah is the stage name of Derek Johnson (born January 27, 1950), taken from his grandmother. He is a popular but controversial English cable and satellite television personality, who has come to fame as a self-described psychic medium.

https://en.wikipedia.org/wiki/Derek_Acorah

Right - thanks, I knew I'd heard the word but couldn't think where and thought it must have been in a book or something.